Sadie Jenkins (played by Georgia Lock) is seen to be always speaking to the camera. She is portrayed as a girl who often takes advantage of her friends namely Dede Baxter and Kit Karter, for talents and takes credit for them. She realises about her wrongdoings and her friends stick by her. Sadie has a sibling played by Danny Jenkins, and her parent played by Steve Jenkins, with her dog played by Roger and a mechanical apprentice (Keith) with whom she shares a household. All of these are male people, hence, her habits are those of a boy and there is no girl role model for her to look up to apart from Cheryl Cole who she calls 'Chezza'. This is the reason why some of her fashion tastes are so boyish, she has such bad manners and is better than her brother and his best friend at football. Sadie is often called the 'Sasster' and 'Sassie J'. She has a boyfriend, Taylor at the beginning of the third series who her father doesn't accept at first, but does so eventually.
Deliah 'Dede' Baxter (played by Priyanka Patel) one of the three primary main characters is portrayed as a girl who is extremely clever and determined to achieve 100% in everything. She does not have much in common with Sadie, but she is often taken advantage of and has her talents exploited. This happens to Dede more often than it does to Kit. For example, she has 'the voice of Mariah Carey' in one episode, when Sadie is determined to prove herself as a fantastic singer, she uses Dede's voice and mimes so that she is no longer a social outcast. In a bid to prove herself to Kit as a fashion icon, Sadie attempts to make a dress that everyone thinks is horrible. Dede agrees to help her and uses her history knowledge to create the 'perfect costume' for 'The Y Fundraiser'. Everyone agrees it is a wonderful dress and Sadie takes credit for it. Dede is also known as the 'Deedster'.
Christopher "Kit" Karter (played by Ronan Carter) is also one of three primary main characters and is a flamboyant teenager. He always participates in productions and knows the latest fashions off by heart. He is a celebrity follower and knows the latest music too. It is also revealed that he has a secret talent for cooking and he makes top quality 'Pixie Lott Pies'. He has common interests with Sadie in that both of them want to be at the top of the social hierarchy. He also calls himself 'Kitty Kat', with other characters calling him it as well. In the third series, he leaves to live with his dad in Brazil.
Steve Jenkins is the widowed father of Sadie and Danny and runs a mechanic business from his garage. He stands up for Sadie and his character is a kind, but gruff person who can be considered 'uncool' and loves his family. In the third series, he begins dating Beverley who runs a salon, but takes a while to tell Sadie.
Keith Woods is Steve's apprentice. He is portrayed as stupid and often helps Steve with many other things besides his mechanics business. He lives with Steve and his family and is like Steve's brother or son.
Ashlii Summers is Sadie's nemesis. She boasts about her looks. In Blackmailamundo, in return for not telling Steve that Sadie broke her curfew, she treats Sadie like a slave. She only appears in series 2, taking over the waitress job from Chloe. She is the daughter of Steve's new girlfriend Beverley
Dani, portrayed by Dani Harmer will join the cast in series 3, episode 5. She will be an acting teacher for Kit's drama school classes. She will rent a room in Steve's house. She will have a major part in the show, and starting series 3, episode 6, she will be added to the credits.
She ended up not taking part in the show due to unknown reasons. (Possibly because Kit left and the show had to be re-written.)