Talos

Talos, The Legendary Automaton.
First appeared in Season 2.
He was sent by The Zeus Initiative to kill Fionn Corvin during Clearwater High's Paintball game.
He was defeated by Fionn but not destroyed. When Brandon Van Graff discovered he had no previous memories and was having his memory wiped after every mission, he wiped Talos's memory a final time, then disabled that switch and from then on Talos would learn.
Talos was 'adopted' by Fionn and Cord Van Graff who endeavoured to teach him all he needed to become a person.
Talos accompanied Fionn's Squad in The Tartarus War.
Season 3.
Having fought in protect the Portal of Tartarus he failed when Tartarus made his way through to Earth. He followed after to ensure the safety of the Warchild. Was fatally wounded in a confrontation with Tartarus on the campus of Clearwater Community College but managed to meet Ford. He showed Ford a recording of his birth, referring to Fionn as his 'programmer'.
Close to death he asked that Ford preserve his memory by unlocking his CPU.