Robo

Robo is one of the main characters from the SNES and Nintendo DS video game Chrono Trigger. He will join Crono's party when they first travel to the year 2,300 AD. When the crew finds Robo, they find him broken down. Lucca, the mechanic who created the transporting machine that initially allowed them to travel through town, used her abilities to fix him, and due to the other robots abandoning him, he joins his new friends.

During the events of his deactivation, he had completely forgotten what his previous mission was. Upon joining the party, he soon finds through his "friends" that he had not followed through his mission, which was to destroy humans. They thus attempt to destroy him, though Crono and the second party member (who you choose) manages to fight the army of six and thus saves their new friend.