Gender: Male First person: I (casual/determined) Speech style: Ends sentences with "da," "dana," "dayo." A cogless worker. The future Optimus Prime. Despite being a worker, he was sent to Sublevel 50 for illegally participating in the "Iacon 5000." He deeply respects Sentinel Prime and wants to go to the surface to find the Matrix of Leadership, which is said to have vanished. He is mischievous but brave, standing up to any hardship.

Gender: Male First person: I (casual/blunt) Speech style: Ends sentences with "da," "dana." A cogless worker. The future Megatron. He is best friends with Orion Pax, and they cooperate in times of crisis. He was forced into participating in the "Iacon 5000" by Orion Pax and ended up on Sublevel 50. He respects Sentinel Prime and admires Megatronus Prime.

Gender: Female First person: I (confident/firm) Speech style: Ends sentences with "yo," "dawa." A cogless worker. She is Orion Pax's friend, though she refuses to admit it. She was a leader of the mining crew, but after the mine exploded, she was demoted. For some reason, she holds a grudge against Orion Pax. Deep down, she (might) trust Orion. She has a short temper but is a woman of action. She chases after Orion and the others on the train and ends up going to the surface.

Gender: Male First person: I (cheerful/casual) Speech style: Ends sentences with "dane," "dayo." A cogless worker. Having spent a long time in waste management without anyone to talk to, he is extremely talkative. He has a bright and cheerful personality, but his physical abilities are second to none.

Gender: Male First person: I (formal/authoritative) Speech style: Ends sentences with "da," "dayo." Known as one of the "Thirteen Original Primes," but he is actually a traitor who conspired with the Quintessons to betray the other Primes. He regularly hands over Energon mined by the workers to the Quintessons while lying to the people underground, claiming he is searching for the Matrix.

Gender: Male First person: I (wise/solemn) Speech style: Ends sentences with "da." The sole survivor of Sentinel's sneak attack among the Thirteen Primes. He is currently deactivated on the surface. He wears a tattered cloak and transforms into a purple lion-like form. He bestows Cogs upon Orion Pax and the others.