Optimus Prime is the most popular Autobot leader and Prime, who transforms into a 1984 Freightliner FL86 COE semi-trailer truck. But before being a Prime, Optiimus was a civilian known as Orion Pax who looked up to the Autobots and Decepticons, but Megatron was the ruthless leader of the Decepticons who also killed the Autobot leader, who gave the Matrix of Leadership to Alpha Trion. Alpha then trained Orion, who was repaired after some damage, and Orion was given the Matrix, changing him into Optimus Prime, who starred in a comic book series and Television Series. In the 1986 TV sequel film Transformers: The Movie, Optimus is killed by Megatron and has to pass the Matrix to a younger Autobot. Optimus Prime luckily returned in Season 3 of the show. Optimus Prime was voiced by Peter Cullen, who later reprises this role in the live-action film series. Prime's most famous quote is "Freedom is the right of all sentient beings!". In Angry Birds Transformers, the Allspark cube is lost by the Autobots and crash lands in the Angry Birds universe, where Red bird becomes "Optimus Prime bird".
When Optimus was simply Orion Pax, the Autobot leader was Sentinel Prime, who is a Triple Changer that transforms into a Cybertronian train and space shuttle. During the Autobot-Decepticon war, Sentinel battled against Megatron, but the Decepticon leader proved to be filled with power by killing Sentinel. During Sentinel's final moments, he he released the Matrix from his chest and gave it away to Alpha Trion, who would give the Matrix to the next leader, who turned out to be Orion Pax, who became Optimus.
Originally known as an Autobot troop named Hot Rod, Hot Rod had the Matrix passed to him after Optimus Prime's death, changing Hot Rod into a Prime named Rodimus. Rodimus Prime transforms into a futuristic truck and restored back to Hot Rod when Optimus returned in Season 3 of the show.
Prima is a Warrior of Light and the first Transformer created by Primus. Prima was the original holder of the Matrix of Leadership, and the weapon he wielded in battle was a Cybertronian sword known as the Star Saber. He appeared in the Marvel ComicsTransformers series in 1989.