List of The Familiar of Zero characters
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- Louise Françoise Le Blanc de La Vallière (ルイズ・フランソワーズ・ル・ブラン・ド・ラ・ヴァリエール Ruizu Furansowāzu ru Buran do ra Variēru?)
- Voiced by: Rie Kugimiya (Japanese), Cristina Vee (English)
- Louise is the female protagonist of the series. She is introduced as a second-year student at the Tristain Academy of Magic. She is the third daughter of the Vallière family, an aristocratic family well known in Tristain. As a noble, Louise defends her honor as a benevolent person. She states that it is her responsibility as a noble, to make sure her highness the princess is safe and that of her familiar's well-being. Louise is a very stubborn girl. But, as Henrietta mentions, her heart is pure. Louise is nicknamed "Louise the Zero" for her seemingly poor magic abilities that usually result in explosions. During the ceremony when all second year students summon their familiars, Louise summons an ordinary human, Saito Hiraga. At first, Louise treats Saito as a servant or pet, having him wash her clothes, and having him lay on a bed of hay. Louise quickly becomes jealous whenever Saito interacts with other girls, and punishes him regularly by whipping him with a riding crop or blowing him up with her magic. As the series progresses, Louise begins to develop feelings towards Saito and eventually falls in love with him. In the 14th light novel, their relationship becomes deconstructive, when Louise had Tiffania erase her memories of Saito in so she won't be corrupted in order to counteract Joseph's invasion in Romalia. Saito however restored Louise's memory by sharing his own via kiss, which she develops a tsundere trait.
- During Albion's invasion of Tristain, Louise discovers that she is an extremely rare Void Mage, an element descended by Brimir the founder of Halkeginia 6,000 years ago, which explains her consistent failure to perform other forms of magic. Her Void spell is 'Explosion', when released, her powers can easily destroy armies, yet takes time beforehand to cast it. Louise casts off her status as an aristocrat in order to rescue her classmate, Tabitha, when she is taken prisoner by her uncle. After they return, the Queen of Tristain adopts Louise as a sister, which makes Louise second in line to the throne. Louise became a priestess, along with Tiffa, for the Pope's anniversary enthronement.
- At the end of the fourth anime series, Louise and Saito defeat the Ancient Dragon and affirm their love for each other and get married. As a result, after her marriage, she is known as Louise Françoise Le Blanc de Hiraga de Ornielle (平賀 ルイズ Hiraga Ruizu). After the wedding, Louise used her 'World Door' spell to go to Japan and visit Saito's parents (it's possible they now reside in Japan).
- Louise is named after Louise de La Vallière, a French noblewoman who was the mistress of Louis XIV of France from 1661 to 1667. In 2007, Rie Kugimiya was nominated for Best Actress in a Leading Role at the first Seiyu Awards for her work in voicing Louise.
- Saito Hiraga (平賀才人 Hiraga Saito?)
- Voiced by: Satoshi Hino (Japanese), Jonathan Meza (English)
- Titled Names: Saito Chevalier De Hiraga, Saito Chevalier De Hiraga De Ornielle
- Saito is the male protagonist of the series who was summoned from Earth (specifically Tokyo, Japan) to be Louise's familiar. Walking home a portal of some kind opened in front of him, he touched it and was sucked through, then finds himself in Halkeginia and meets Louise (in the light novel he kept his laptop). Then the bond of him being her familiar, involves having a kiss with the familiar, which was a shock to him. At first Louise and Saito did not get along and Louise treated him quite poorly. But as the series progresses, the two eventually come to understand each other and fall in love. Whenever Saito pays any attention to another girl, especially her chest, Louise is quick to punish him. In the anime, Saito's punishment is usually a whipping from Louise's riding crop, or a blast from her void explosion spell.
- When Louise forms her familiar contract with Saito, the runes "" are inscribed on Saito's left hand. The runes signify Saito's status as Gandálfr (ガンダールヴ Gandāruvu, "Gundolf" in Geneon anime, lit. "God's Left Hand"), a legendary familiar with the ability to excel in the use of any object crafted as a weapon simply by touching it; he can wield melee weapons and war machines that include a World War II A6M Zero Fighter; Tiger I (light novel only). It does not extend to weapons crafted for ornamental purposes. As the series progresses, it is revealed that a Gandálfr exists to protect a Void Mage as they cast their spells. After being mortally wounded from fighting Albion's army at the end of the second anime season, Saito is revived by Tiffania, but he loses his Gandálfr power  until Louise re-summons him and renews his contract. He is then knighted by Henrietta and made a vice-captain of the student Undine Knights led by Guiche.
- In the fourth anime season, after Saito becomes the lord of the region called De Ornielle, it is discovered that Saito is not just Louise's familiar, but also Tiffania's familiar. Therefore, he has a newly gained familiar ability known as Lifdrasir (God's Heart) that allows him to boost Void magic to the user he touches (his life-force is drained every time he uses this ability). This ability was depleted after fighting the Ancient Dragon, according to Derflinger. When they fought the Ancient Dragon, and fail to destroy it the first time, Louise sends Saito back to his world using the World Door. Later, Saito manages to come back through a solar eclipse with a F-2A Jet Fighter, and they then destroy the Ancient Dragon permanently.
- Saito's weapon is a cheap sword Louise bought, which turns out to be the talking sword Derflinger (Derf) (Voiced by: Tetsuo Gotō (Japanese), Kaiji Tang (English). Derflinger later reveals that he was once the partner of Gandálfr from 6,000 years ago, and that it was no coincidence that Saito and Derflinger are now partners. Derflinger has the ability to absorb spells. He was destroyed in Saito's first confrontation with the Ancient Dragon, but returns as he was actually dormant inside of Gandálfr. Saito is named after Gennai Hiraga, who was a Japanese scientist from the Edo period, and his name is written as "ability man". At the end of the fourth anime series, Saito and Louise get married.
Tristain Academy of Magic
- Tabitha (タバサ Tabasa?)
- Voiced by: Yuka Inokuchi (Japanese), Jennifer Alyx (English)
- Tabitha is a quiet girl who is a classmate of Louise, and best friend of Kirche. She is usually focused on a book and uses a large curved staff for her wand. She does not show any emotion on her face, says little about herself, and often does not respond to questions or gives short incomplete answers. The name Tabitha is an alias; her real name is Charlotte Helene Orléans de Gallia (シャルロット Sharurotto?), daughter of the King's murdered brother, and the rightful heir to the throne of Gallia. During the first season, it was explained that Tabitha's mother had gone mentally ill due to the effects of a particularly potent poison that had been meant for Tabitha. The name 'Tabitha' originally belonged to a doll given to Tabitha by her mother. Tabitha's mother views the doll as her daughter, and her real daughter as a mere outsider who threatens to tear the family apart. Percerin, the family's butler, claims it was the event of her father's murder and her mother's madness that drove a previously lively and open Tabitha to become introverted.
- Tabitha is a triangle mage who specializes in Wind magic. Tabitha later 'levels' to a square Water/Wind mage equal to Ice magic. She is also a chevalier knight, which is the lowest rank of knight. By the end of the third season, she starts to develop feelings for Saito after he rescues her. Tabitha's familiar is Sylphid aka Illococoo, a nature dragon. In the fourth season, Tabitha gives the potion that restores her mother's sanity. Soon after Tabitha is declared the heir to the throne of Gallia, but postpones the coronation to live with Saito in De Ornielle with Louise and Siesta. Later, Tabitha made her decision and becomes the new queen of Gallia. In the novel, she has a twin sister called Josette, who is Julio's lover and a Void mage after Joseph.
- Tiffania Westwood (ティファニア ウエストウッド Tifania Uesutouddo?, also "Tiffa")
- Voiced by: Mamiko Noto
- Tiffania is a well-endowed Half-Elf who joins the cast in the third anime season. Saito remembers her as "the Big-breasted fairy who restored his life" during the war between Tristain and Albion. Tiffania's parents were the Archduke of Albion and an elf woman who is his mistress; she and Henrietta are cousins since her father is Henrietta's uncle. Tiffania's magic comes from a ring her late mother left her; however, when she revived Saito, the gemstone on the ring was consumed. She later discovers she is a Void Mage, sought out by Sheffield and Joseph, with the spell of 'Memory Wipe' that erases people short memory events (also can wipe out magical compulsion on the mind), and that her familiar is Saito, who as a result, has two masters. Also, her confused feelings for Saito are realized during the fourth season.
- After her royal heritage of Albion is recognized by Henrietta, Tiffania moves to the Academy, where she was ostracized at first due to her elven origin, but was later accepted with Saito's help. Her beauty and kindness are a source of admiration for many of her classmates at the Academy, and just like all other women who gets close to Saito, she is a constant source of jealousy for Louise. Tiffania is rather naive for her age. Unlike Saito's promise to Louise, though, which was because he truly loved her, Saito's promise, "I will protect you", to Tiffania was only due to eternal gratitude for resurrecting him.
- Kirche Augusta Frederica von Anhalt Zerbst (キュルケ Kyuruke?)
- Voiced by: Nanako Inoue (Japanese), Lauren Landa (English)
- A triangle fire mage and Louise's classmate, Kirche is from a military family in Germania. She attends the Academy rather than a local school because she developed a bad reputation for misbehaving. She has dark skin, red hair, and a large bust, and loves to use her looks to her advantage, fully aware of the effect she has on men. Fire magic is her specialty, drawn from her passionate nature. She enjoys making fun of Louise as her family and the La Vallières are rivals. She is flirtatious and has dated (and according to the light novels, heavily implied that she has slept with) many of the Academy boys, but Kirche is especially smitten with Saito. Often her affections for Saito result in his getting punished by Louise. By the third series, her interest in Saito seems to have diminished and her affections now appear to be directed toward Colbert. In addition, she seemed to rather have softened a bit towards Louise, though only in critical situations. Kirche's familiar is a salamander, named Flame. Her name ironically means 'Church' in German. In another stroke of irony, she winds up falling in love with an older man, when, previously, her refusal to marry one is what led to her being enrolled at the academy. In the fourth anime series, she and Montmorency are seen spending much more time together, as Tabitha has left the school to rule over her kingdom.
- Guiche de Grammont (ギーシュ Gīshu?)
- Voiced by: Takahiro Sakurai (Japanese), Nicholas Manelick (English)
- Guiche is one of Louise's classmates who, despite being in love with Montmorency, is a vain playboy who flirts with women. He comes from a noble family with a deep military history; his father is a general. His wand is in the form of a long stemmed rose, and he specializes in Earth magic, and summoning Valkyries. He likes to dote upon his familiar, a giant mole named Verdandi.
- When Saito exposes Guiche's two-timing activities, Guiche is offended and challenges Saito to a duel, only to lose when Saito's runes on his hand activates. As a result, Guiche becomes self-conscious of his fighting abilities and a little cowardly during conflicts, but tries to help his classmates anyway. Guiche and the academy boys join the army for the Albion war; in the light novels, Guiche was placed into a ragtag battalion with low morale. His company was the first one into the City of South Gotha, where he was mortally wounded in battle but then revived by a fairy; Tiffania. In the third anime season, Guiche becomes a captain of the student Undine Knights, and he makes Saito his vice-captain.
- Montmorency Margarita la Fère de Montmorency (モンモランシー Monmoranshī?)
- Voiced by: Mikako Takahashi
- Montmorency is Louise's classmate. Like most Tristain nobles, she has a great deal of pride. She also had made a contract with a Water Spirit. She has feelings for Guiche, but remains jealous whenever Guiche flirts with other girls. In the first anime season, she creates a love potion but Louise unintentionally drinks it and falls for Saito. She is one of the few females not competing for Saito's affection. Montmorency's familiar is an frog named Robin, and her specialty is Water magic where she summons the Water Spirit that has helped out her family before. Although relegated to more of a supporting position in the first two anime series, her importance gradually increased as she started being included in the missions and spending more time with the main cast of characters. By the fourth series, she and Kirche are also shown to have grown closer, frequently spending more time together after Tabitha has left to rule her kingdom.
- Beatrice Yvonne von Guldenhorf (ベアトリス Beatorisu?)
- Voiced by: Ayumi Tsuji
- Beatrice is a student introduced in the third anime season. She is a noble princess of a small but powerful country. She initially uses her position to bully Tiffania for her recent popularity, and Guiche warns Saito not to confront her. After learning that Tiffania is a half-elf, she captures her and conducts a "heresy trial" so that Tiffania must prove her loyalty to the humans' deity or be forced to leave. However, when Louise pointed out that Beatrice was lying about having the religious authority to conduct such a trial, the other students turned on her and gave Tiffania the right to choose Beatrice's punishment, but instead Tiffania forgives Beatrice and asks to be friends.
- Malicorne de Grandple (マリコルヌ Marikorunu?)
- Voiced by: Hikaru Tokita
- Malicorne is a portly magic student at the Academy of Magic by Tristain where it is part of the Undine Knights under Guiche. Malicorne's familiar is an owl, named Cubasil. He possesses a far vision spell that lets him visualize at least 15 miles. He had a crush on Tabitha's familiar Illococo but finds out she is a dragon in a human form.
- Reynald (レイナール Reināru?)
- Voiced by: Masahiro Yamanaka
- Reynald is a glasses-wearing student introduced in the third anime season as one of the Undine Knights under Guiche. He is quite clever and good friends with his fellow students, such as Gimili who is also member of the Undine Knights.
- Siesta (シエスタ Shiesuta?)
- Voiced by: Yui Horie (Japanese), Xanthe Huynh (English)
- Siesta is a maid at the Academy. She loves Saito and treats him kindly. She seems to know how poorly Saito is treated by Louise, and she is sure that she would make Saito much happier than Louise does. She is the eldest of eight children, and her hometown is Tarbes ("Talb" in Geneon anime). Towards the end of the first season, Siesta learns that her great-grandfather, Takeo Sasaki, was a Japanese Naval Ensign from World War II who piloted a Mitsubishi A6M Zero Fighter plane into Halkeginia and did not return to Japan; this explains why her hair and eyes are similar to Saito's. In the second anime season, she becomes more romantically aggressive and determined to win Saito's heart even though Saito has declared his love for Louise; Siesta even confesses her love to Saito and kisses him. After Saito is knighted, Siesta becomes his personal maid as ordered by Henrietta. Sometimes she intentionally allows Saito to be mistreated, so she can take care of him afterwards. Her name is based on the siesta in Spain.
- Scarron (スカロン Sukaron?)
- Voiced by: Tetsuo Gotō
- Scarron runs the pub Miwaku no Yousei which is similar to the modern day maid cafe with all the waitresses dressed in colorful and revealing maid uniforms. Although he is muscular, he speaks and gestures effeminately and asks his workers to refer to him as "ma madamoiselle". He also likes to say "Tres Bien!". He is also the father of Jessica and is later revealed to be Siesta's uncle.
- Jessica (ジェシカ Jeshika?)
- Voiced by: Akari Higuchi (Japanese), Michelle Ann Dunphy (English)
- Scarron's daughter is the draw at the pub run by her father. She is Siesta's first cousin on her maternal side, and she is also descended from Japanese. Like Siesta, she seems to be fond of Saito and uses her shapely chest to charm him.
- Osmond (オスマン Osuman?)
- Voiced by: Takeshi Aono (Season 1-3), Bin Shimada (Season 4)
- The elderly, white haired headmaster of the Tristain Academy of Magic. He initially shows a serious side, but is also perverted, as he uses his mouse familiar to peek at Longueville's panties. He is a smart and powerful square mage that Henrietta finds trustworthy. 30 years before the start of the series, he was fighting a dragon but was saved by a man from another world (an American soldier from the Vietnam War) who used a rocket launcher that Osmond dubbed the 'Staff of Destruction'. His element is wind magic. He entrusts the Founder’s Prayer Book to Louise when he learns that she is a user of Void.
- Jean Colbert (コルベール Korubēru?)
- Voiced by: Takuma Suzuki
- Mr. Colbert is a professor at the Tristain Academy of Magic who is interested in history; his element specialty is fire magic. He is one of the few people that Saito have in common with. His interest in technology from Saito's world helped him create dragon's blood (actually gasoline) to fuel an airplane. It is revealed that he was the captain of the magic troops sent to burn Agnès' village, D'Angleterre, 20 years ago, but also the person who rescued her, when he found out the village wasn't "plagued", and devoted himself to atone for the sin he committed. He has an anti-war attitude, and is envious when he finds out that modern Japan is not ravaged by war. He reveals himself as the Flame Snake when Albion sends hired mercenaries to attack Tristain Academy, and sacrifices himself to protect Agnès. In the third season, Colbert surprises everyone as he returns with Kirche to Tristain Academy; he had Tabitha cast a spell to fake his death, and was staying with Kirche's family. He constructed a giant airship called the "Ostland", based on Saito's Zero Fighter.
- In the novels, Tabitha did not cast a spell on Colbert. Instead, Kirche tricks Agnès into thinking that he is dead. Louise and Saito were also not present during the Academy invasion. He is likely named after Jean-Baptiste Colbert, finance minister to Louis the XIV from 1665 to 1683.
- Chevreuse (シュヴルーズ Shuvurūzu?)
- Voiced by: Noriko Suzuki
- Chevreuse is a new professor at the Tristain Academy of Magic. Nicknamed The Red Earth Chevreuse, she specializes in earth type magic.
- Longueville (ロングビル Rongubiru?)
- Voiced by: Akiko Kimura
- Longueville is Osmond's attractive bespectacled secretary with dark green hair. She is normally calm and friendly, but becomes angry and violent whenever Osmond tries any lecherous moves on her. She is able to use magic despite coming from a noble family who lost their rank. In the season 1 storyline, she reveals herself to be Fouquet the Sculptor, a triangle mage who summons a giant earth golem to steal the Staff of Destruction, and stages a fight between her golem and Louise and her classmates to try to discover how to use the Staff. After observing Saito, Fouquet snatches the Staff, and fires it, but fails, because she only had one projectile. Fouquet is then arrested, but later escapes; she joins Reconquista, and assists Cromwell and Wardes, who refers to her as Matilda of Sachsen-Gotha. Although Kirche and the students call her an old woman, Fouquet adamantly replies that she isn't old and that she is only 23. She appears only in the first season.
- In the light novels, Fouquet would turn walls and doors into dirt and steal valuables from noble's homes. She also has a childish side implied by leaving messages whenever she completes a robbery. Fouquet was stated as part of high-class Albion nobility.
- She is likely named after Nicolas Fouquet, a corrupt government official under Cardinal Mazarin and an underage Louis the XIV who most famously accumulated a large fortune while serving as finance minister until his eventual arrest in 1661.
- Henrietta de Tristain (アンリエッタ Anrietta?)
- Voiced by: Ayako Kawasumi
- Henrietta is introduced as the princess of Tristain; her element is water magic. She is loved by her nationals and is a childhood friend of Louise. She defends Tristain from the Albion invasion after the assassination of her lover, Prince Wales. Her role is developed more in season two, where she is crowned queen (although Louise and her friends still refer to her as Princess), and must deal with an impending war with Albion.
- Henrietta seems to be friendly with Saito, even though she was unintentionally kissed by Saito on the lips in the first season. In a season two episode, Henrietta has Saito be her bodyguard, but they find themselves in some heavy but feigned romantic situations: when she is walking with Saito on the street and pretends to be his lover, she puts his hand on her chest; when the guards barge into the inn room where she and Saito are hiding, she passionately makes out with him. In season three, Henrietta starts showing romantic feelings to the point where Louise considers her a love rival. At the Slepnir Ball, Henrietta disguises herself as Louise, receiving a hug and a kiss from Saito. When Saito asks to go to Gallia, Henrietta refuses, and in the process, holds his hands, which shocks Louise, Saito and even herself when she realized it. She tells Louise she does not know whether she is rebounding from Wales or if she is truly falling for him. In the fourth anime season, Henrietta admits she has feelings for Saito. Louise is not happy about this, and they had a brief fight over it.
- Henrietta's feelings for Saito are made more apparent in the light novels. During the Slepnir Ball, Henrietta explains that she has been in love with Saito since the night they kissed at a small inn at Tristain. Saito was initially determined to not go further with Henrietta, but Henrietta just wanted to "spend a few moments of happiness" with him. They kissed each other, and Louise discovered them. Ultimately Louise accepts her feelings for Saito, but slaps Henrietta for "using her familiar".
- Henrietta is named after Princess Henriette Anne Stuart of England from 1644 to 1670, a Princess of England and Scotland, cousin of Louis XIV and wife of his brother, Philippe of France.
- Agnès Chevalier de Milan (アニエス Aniesu?)
- Voiced by: Michiko Neya
- Agnès is introduced in the second anime season as the Captain of the Tristain musketeers in service of Henrietta. She hates Mages, especially fire-element ones. She prefers to use a pistol or sword; she states that in combat, it is quicker than casting a spell. One of her motives for joining Tristain's army is avenge her parents who died when her village, D'Angleterre, was razed, and she tracks down the people responsible. Her sexual preference is questioned when Siesta speculates to Louise whether Agnes prefers girls; Louise unintentionally affirms it because Agnès recently kissed Louise on the lips during a spying mission in an attempt to draw attention away from themselves. She kills Lishman, a politician who tricked the government into burning the village, and tries to fight the former vice-captain of the army when he holds the academy girls hostage, but learns that the captain of that army, the Flame Snake, is the primary man responsible. She then learns that Colbert is the Flame Snake but also the one who saved her life, after noticing the burn scar on his back. After Colbert sacrifices himself in season 2 but returns in season 3, Agnes gives up thirsting for vengeance; she eventually tells Colbert that he has to make amends one hundred times over for each member of her village.
- In the novels, Agnes was asked by Henrietta to find Saito after his battle with the Albion army. She found him in Tiffania's village, and discovered he had lost his Gandalfr powers. She then trains Saito in swordwork, with some success.
- Eléonore (エレオノール Ereonōru?)
- Voiced by: Kikuko Inoue
- Full Name: Eléonore Albertine Le Blanc De La Blois De La Vallière
- Eléonore is the oldest of the three La Vallière sisters, with blonde hair and eyeglasses. She is very strict, strong-willed, and even uses a whip. Her personality is stronger than "Chibi-Louise's" in all aspects, except that she looks down on commoners such as Saito. She has a passionate nature sometimes expressed through her dreams; after her engagement was called off by her lover, she becomes infuriated whenever the topic comes up, insisting that Louise get married. She and Cattleya join the magic academy during the second anime season to watch over Louise. By the end of season 4, Eléonore finally accepts Louise's feelings for Saito.
- Cattleya (カトレア Katorea?)
- Voiced by: Kotomi Yamakawa
- Full Name: Cattelya Yvette La Baume Le Blanc de La Vallière
- Cattleya is the second oldest of the three La Vallière sisters, with pink hair like Louise. She is more easy-going and gentle towards Louise and her friends than Eleonore, and Saito notes she also has a large chest. She uses Earth magic and is often seen with a variety of small pets and animals. She is also introduced in the second season of the anime. More than anything, she longs for Louise’s happiness, and is fine with the fact that Louise has feelings for a peasant, Saito.
- Wardes (ワルド Warudo?)
- Voiced by: Tomoyuki Shimura
- Wardes is introduced as the Captain of Tristain's Magic Guard, known as the Griffin Knights. He claims to be Louise's fiancé since he befriended her as young girl. He is a highly skilled swordsman who also uses magic to easily defeat Saito in their first practice match. He escorts Louise to Albion, but misleads her into thinking Saito and friends have left them. After Louise meets with Wales, Wardes insists on marrying her right away at Albion. He then stops her from delivering Wales's reply letter. After capturing her, he reveals he is part of the Reconquista faction and a traitor. Both the novel and anime imply that he is aware of Louise's potential as a Void Mage and interested in her primarily for that reason. At the wedding, Wardes stands with a spell-bound Louise, but it is interrupted when Saito barges in and frees Louise from the spell. He takes the opportunity to kill Wales. Saito eventually defeats Wardes with a cut to his hand, however, Wardes escapes. In the novels, Saito and Wardes reach a stalemate when fighting during the war. In the anime, Wardes is killed by Louise's revealing Void Magic: "Explosion".
- Sheffield (シェフィールド Shefīrudo?)
- Voiced by: Masako Katsuki
- Sheffield is the main antagonist for the second and third anime seasons. A mysterious beauty, Sheffield is introduced as Cromwell's secretary in the Reconquista faction, but she later kills Cromwell after he is captured by Tristain and takes possession of the Ring of Andavari, which furthers the war between Albion and Tristain. Sheffield poisons South Gotha's water supply so those who drink it will also revolt against Tristania and Queen Henrietta. In the third anime season, she reveals that she is Myozunitonirun (God's Brain), a familiar of a Void Mage. Her power is to allow her to use any magical artifact, and gives her insight into magic theory. She later reveals that her master is Joseph, the current King of Gallia, who is searching for other Void mages. She served Joseph out of a desire to be loved by him.
- Joseph (ジョセフ Josefu?)
- Voiced by: Jūrōta Kosugi
- The current king of Gallia and Sheffield's master as well as Tabitha's uncle. Considered to be cold-blooded amid his hunger for power, it's revealed that he killed Tabitha's father, Charles, due to the efforts to ascend to the throne, and was behind the potion that drove Tabitha's mother to go insane. He is also a Void Mage with the ability of 'Acceleration', speeding up his movements. He is obsessed with the Founder's Music Box. Throughout the majority of Joseph's part in the story, in his heart there is nothing; no tears, or sorrow, a true 'Void' in his heart. It is revealed when he caused destruction in Romalia, he's motive to see if any sense of remorse is within himself. Sheffied captured Louise and hands her over to him to gain her Explosion spell, but later is rescued by Saito and Tabitha. He pass away on a ship with his beloved Sheffield by a detonated Firestone and he could feel emotions for once.
- In the novel, Joseph is married and has a daughter named Isabella. Angered by her father Joseph's death, Isabella initially was cold and rude to Tabitha but when brought to Tabitha's mother, she realized that they were the only family left and felt a change in her heart. She then decided to become a nun to compensate for her father's sins.
The Gensou Siblings
Also known as the elemental siblings
- Damiem (ダミアン Damian?) Voiced by: Mutsumi Tamura
- Bleu (ブルー Burū?) Voiced by: Yuichi Iguchi
- Jack (ジャック Jakku?) Voiced by: Itaru Yamamoto
- Jeanette (ジャネット Janetto?) Voiced by: Natsumi Takamori
- The Gallia Knights, also revealed to be mercenaries, that appear in the fourth season. King Joseph had them steal the Founder's Round Mirror and handed it over to him. Bleu and Jeanette are happy into fighting with Saito and capturing Louise. Jack summons golems like Guiche's Valkyries. Once they'd fought with them at Saito's De Ornielle, but Damiem put a stop to it since it's not actually worth any money. Tabitha hires their help in the battle with the Ancient Dragon at the school when she became the queen of Gallia.
- Wales Tudor (ウェールズ Wēruzu?)
- Voiced by: Masahiro Yamanaka (Japanese), Jonathan Koontz (English)
- Wales is the Prince of Albion and Henrietta's cousin. Three years ago, Henrietta makes a vow of love at Lake Longorian to always be together with him, but Wales does not reciprocate; he promises instead to walk alongside her, and to not worry others. When Louise visits with Henrietta's letter, Wales tells her of the conspiring Reconquista faction. He presides over Wardes and Louise's wedding, but after Saito interrupts the ceremony, Wardes betrays him and kills Wales, devastating Henrietta when she hears the news. However, in a later episode, Wales appears to be alive before Henrietta, and takes her to the lake to renew their vows, but he is actually under the control of Sheffield and Cromwell, who have used the Ring of Andvari to give him a false life. Louise eventually stops him with some high powered dispel magic. Wales is freed from the ring's control; he asks Henrietta to change her promise so she can fall in love with someone else, and his false life expires.
- Wales is a triangle wind mage, but in the second season, he showed that nobles of royal heritage can combine their magical power with other royals; with Henrietta he creates hexagonal class magic, which combines wind and water.
- Cromwell (クロムウェル Kuromuweru?)
- Voiced by: Jirō Saitō
- The leader of Reconquista who is responsible for the Albion war. He is the one who gave the orders to Wardes to kill the Prince of Albion. He also uses the 'Ring of Andvari' that they stole from the Water Spirit to control people. In the light novels, he is killed during Gallia's bombardment of his HQ after Gallia reneges on the secret treaty. In the anime, he is defeated by Louise's classmates in the invasion of Tristain and thrown in jail, but during the events of Henrietta's coronation, he is killed in his cell by Sheffield, who has reclaimed the ring. Cromwell is named after Oliver Cromwell, a political leader in England in the 17th century.
- Henry Stalford (ヘンリー Henrī?)
- Voiced by: Wataru Hatano
- An air fighter that Louise and Saito befriend when fighting over the City of South Gotha in Albion during the war in Season 2. Henry initially tries to attack Saito but his leg injury renders him useless. Saito and Louise help Henry out, and Louise convinces Henry to marry his fiancée instead of abandoning her for the sake of noble reputation.
- Julio Chesaré (ジュリオ Jurio?)
- Voiced by: Daisuke Hirakawa
- A knight from the Holy Empire of Romalia sent as transfer student to Tristain Magic Academy. He has the Moon Eyes (月目?), as his eyes are heterochromic—one red, one blue, like the two moons of Halkeginia. Julio is sent by Romalia's Pope as his support for Henrietta's expedition to Albion, now in political strife after the fall of the royal family followed by the death of Reconquista's leader. Julio is also the familiar of the Pope of Romalia, also known as Windalfr (God's Right Hand), who has the ability to communicate with and command magical creatures in the same way that Saito can wield weapons. In one instance, he single-handedly defeated nine dragon knights of Albion. He is sometimes treated with disdain by others because he's a priest. In the novels, he is also portrayed as rather manipulative. He is named after Julius Caesar.
- Although not a mage, Julio is a dragon knight and expert swordsman. During his duel with Saito to win Louise's kiss, Julio could have easily won against Saito—who does not use Gandalfr's skill, but he let Saito win to tease him. He has beautiful looks and a personality that grants him popularity among girls. He can be considered a replacement for Guiche after his depart to the military service because he is similar to Guiche in looks—however, Julio is worldly, as opposed to the vain, foolish Guiche, and hardly had to exert effort to charm most of the female students in the Academy.
- In the anime, Julio initially pursues Louise, although on multiple occasions, he helps fix Louise and Saito's relationship. In the novels, he falls in love with Josette, the twin sister of Tabitha. Julio also became Josette's familiar as the second Myozunitonirun, after the deaths of Joseph and Sheffield.
- Vittorio Serevare (ヴィットーリオ Vuittōrio?)
- Voiced by: Shinnosuke Tachibana
- Vittorio, the Pope of Romalia who holds the titles of 'St. Aegis the 32nd' and the 'Shield of the Founder', assumed the duties of the throne three years prior to Saito's summoning. He is introduced in the anime in Season 4 when Saito, Louise, and Tiffania were invited at his Cathedral. His appearance is even more of a 'bishounen' than Julio, and he is slightly over 20 years old. He is kind-hearted in that he cares for orphans and is trying to increase the welfare of the commoners, but has to deal with politicking with the nobles in the process. He is a Void user with magic of disintegration, originally the spell of ‘Recovery’, which has an incinerating effect on evil entities. Julio serves as his familiar. Vittorio possesses the Founder's Round Mirror until it was stolen from a treasure room; the mirror allowed the user to look into the past of the Founder Brimir and see the actions of his lifetime. He understands how atrocious his actions are, and knows eventually he will have to step on the path Founder Brimir actions are necessary to save humanity.
- In the novel, Vittorio's mother had taken the Ruby of Fire ring from him and escaped to D'Angleterre to hide, which resulted into burning the entire village by Colbert and his troops to prevent the spread of the 'New Religion'. However, Vittorio was not saddened by his mother's death. In the anime, Vittorio sacrifice himself to the Ancient Dragon to spare Julio’s life.
- Bidashal Vitartial (ビダーシャル Bidāsharu?)
- Voiced by: Kenji Nojima
- Bidashal is an Elf. He appears to be a bit affiliated to King Joseph of Gallia, though he doesn't take orders from him. He is Luctiana's uncle, and possesses very strong Elf Magic, such as being able to repel a strong attack with Counter from Tabitha without moving an inch. He makes three Firestones for King Joseph. They are similar to small A-Bombs created from both Void and Elven magic. King Joseph wants to use them on Romalia. Bidashal gives Tabitha the antidote to cure her mother after the incident in Romalia. He is also part of the Elvin community in a private oasis in the middle Elvish desert territory, Nephthys. Allows Luctiana to keep Tiffania and Saito there for research of humans. He later helps Saito and Tiffania escape through underground. In the fourth season, Bidashal saves Henrietta and her fleet from the Ancient Dragon's fireball.
- Luctiana (ルクシャナ Rukushana?)
- Voiced by: Hisako Kanemoto
- Luctiana is Bidashal's niece. She is an Elf who is obsessed with researching humans and their culture. Luctiana and Arie kidnap Tiffania and Saito because they are a Void mage and Gandláfr; additionally that Saito from another world. She keeps them at a private oasis where Saito discovers a submerged fighter jet. She shows the capability of using magic quite successfully during times of great stress. Later, the Elves at the council try to have Tiffania and Saito terminated, but Luctiana and Bidashal were against it. They help them escape through underground. She and Arie join them later with Louise and the gang on the Ostland much to her excitement to see more of the human world.
- Arie (アリィー Arī?)
- Voiced by: Yasuaki Takumi
- Arie is an Elf and Luctiana's fiancé. He and Luctiana went to the De Ornielle mansion to capture Tiffania and end up kidnapping Saito as well. He shows the capability of using magic swords. Arie reluctantly goes with the humans after escaping the Elves territory with Saito and Tiffania. As they went to Tabitha's coronation in Gallia, Arie quickly learns that humans are not much different when compared to elves. Later, Arie and Guiche get along after seeing Guiche's relationship with Montmorency is similar to his own with Luctiana.
- Sylphid (シルフィード Shirufīdo?, "Sylpheed" in Geneon anime) / Illococoo (イルククゥ Irukukũ?)
- Voiced by: Satomi Arai (Sylphid) / Yuka Iguchi (Illococoo)
- Sylphid is a rare female Rhyme Dragon and Tabitha's familiar. Sylphid doesn't live in the Academy like other familiars because she is too big, so she stays in a neighboring forest. When Tabitha was captured during the anime's third season, Sylphid escapes and notifies Louise and friends by assuming the form of a blue-haired girl named Irukukũ who claims to be Tabitha's little sister. Though she is sensible, she is appears sometimes childish, such as showing no embarrassment when first appearing in the Academy Court Yard naked in front of Saito and the others, because as a dragon she goes about naked all the time. Irukukũ promised her "older sister" that she would not tell anybody about her ability to use shape-shifting magic, but Derflinger is aware of her true nature and ensures that the others become aware of it also.
- Sasha (サーシャ Sasha?)
- Sasha is a female Elf who was one of Founder Brimir's familiars – Gandálfr. She made a pact with Brimir to allow him to experiment on her but he made her his familiar, something Sasha was not pleased about. She was the person who made the talking sword Derflinger as well as the first person to use him. Sasha killed Brimir by stabbing Derflinger into his heart while he tried to kill off the elves for reasons not yet revealed as of the 19th light novel. Although her background story was never mention in the animation.
- Despite already being a Gandálfr Sasha was Lífdrasir as well, similar to her successor Saito Hiraga 6,000 years later. In Brimir's youth, he was an absent-minded genius not unlike Colbert. The Prayer Book suggested at the time of its writing Brimir wanted nothing more than the complete annihilation of the elves and said it's the successor's duty to retake it at all costs. The Round Mirror suggested he did many atrocious things in his life, such as committing genocide, but if he had not humans would have been wiped off Halkeginia; that he wished with all his heart he did not had to commit such atrocities. In his defense, Brimir meant no harm to come to Sasha when he made her his familiar.
- "2014 Guest Listing - Guest Info - Cristina Vee - Voice Actress". Anime Boston. Retrieved 2014-09-10.
- Novel volume 3 - Shiso no Kitousho
- "A Princess' Request". The Familiar of Zero. Series 1. Episode 10.
- ""Sayonara no Kekkonshiki" (さよならの結婚式)". The Familiar of Zero. Series 2. Episode 12 (in Japanese).
- "Louise the Void". The Familiar of Zero. Series 1. Episode 13.
- ""Tsukaima no Kokuin" (使い魔の刻印)". The Familiar of Zero. Series 3. Episode 1 (in Japanese).
- ""Mori no Yōsei" (森の妖精)". The Familiar of Zero. Series 3. Episode 2 (in Japanese).
- ""Eiyū no Okaeri" (英雄のおかえり)". The Familiar of Zero. Series 3. Episode 3 (in Japanese).
- "Zero Treasure". The Familiar of Zero. Series 1. Episode 12.
- Light Novel Characters Perfect File published by Takarajimasha.
- "Tabitha's Secret". The Familiar of Zero. Series 1. Episode 8.
- ""Uwasa no Hennyūsei" (噂の編入生)". The Familiar of Zero. Series 3. Episode 4 (in Japanese).
- "Feverish Temptation". The Familiar of Zero. Series 1. Episode 3.
- "Commoner Familiar". The Familiar of Zero. Series 1. Episode 2.
- ""Shirogane no Kōrinsai" (銀の降臨祭)". The Familiar of Zero. Series 2. Episode 11 (in Japanese).
- "Louise's Change of Heart". The Familiar of Zero. Series 1. Episode 9.
- Novel volume 3 - Ryū no Hagoromo
- ""Variēru no Sanshimai" (ヴァリエールの三姉妹)". The Familiar of Zero. Series 2. Episode 4 (in Japanese).
- "Louise's Part-Time Job". The Familiar of Zero. Series 1. Episode 7.
- "Tristein's Princess". The Familiar of Zero. Series 1. Episode 5.
- "A Thief's Identity". The Familiar of Zero. Series 1. Episode 6.
- "The Atonement of Flames". The Familiar of Zero. Series 2. Episode 9 (in Japanese).
- ""Sureipunīru no Butōkai" (スレイプニィルの舞踏会)". The Familiar of Zero. Series 3. Episode 7 (in Japanese).
- ""Osutoranto Gō no Tsuiseki" (東方号の追跡)". The Familiar of Zero. Series 3. Episode 8 (in Japanese).
- "Louise's Marriage". The Familiar of Zero. Series 1. Episode 11.
- ""Joō no Kyūjitsu" (女王の休日)". The Familiar of Zero. Series 2. Episode 6 (in Japanese).
- ""Joō-heika no Zero" (女王陛下のゼロ)". The Familiar of Zero. Series 2. Episode 1 (in Japanese).
- ""Seishokusha no Ken" (聖職者の剣)". The Familiar of Zero. Series 2. Episode 3 (in Japanese).
- ""Chitei no Himitsu Bunsho" (地底の秘密文書)". The Familiar of Zero. Series 2. Episode 7 (in Japanese).
- ""Mahō Gakuin no Kiki" (魔法学院の危機)". The Familiar of Zero. Series 2. Episode 8 (in Japanese).
- ""Kanchō no Kokuin" (間諜の刻印)". The Familiar of Zero. Series 2. Episode 5 (in Japanese).
- ""Kaze to Mizu no Chikai" (風と水の誓い)". The Familiar of Zero. Series 2. Episode 2 (in Japanese).
- ""Setsurei no Teki" (雪嶺の敵)". The Familiar of Zero. Series 2. Episode 10 (in Japanese).
- "Louise of the Holy Land". The Familiar of Zero. Series 4. Episode 1 (in Japanese).
- ""Tabasa no Imōto" (タバサの妹)". The Familiar of Zero. Series 3. Episode 9 (in Japanese).