Robo

       Robo was found by Crono and his group in a collapsed dome in 2300 A.D. He was fixed by Lucca and became her faithful friend and servant since. He wasn't able to recall his original master's instructions and decided to help Crono to return to their home.
       During their journey, Robo found his other robot companions whom  identified Crono's group as intruders and tried killing them.   He was told that he was a defect and that he should be as obedient as them. Robo realizing this was confused for a moment and almost joined them if it weren't for Lucca's concern for him. Robo was 'trashed' by the other robots and fought Crono and his group afterwards.
      Crono succeeded in the fight and Lucca went desperately to fix Robo again. When he became conscious, Robo joined Crono and Lucca for he was no longer accepted in his home.
      They eventually returned in Robo's time afterwards and there Robo found his old friend Atropos. Robo was glad to see her but realized that she wasn't what she used to be. She too became cold and lifeless just like the other robots he encountered before. Robo was forced to choose between his old and new friends. He decided to go with Crono and fought Atropos alone. Robo won the battle but unfortunately destroyed his best friend. Atropos eventually came back to her old self before she died. Robo heard her familiar voice again for the last time  and received a gift from her as a token of their friendship. Robo, angered by the happenings confronted his evil master and destroyed it. He also promised to help Crono to stop the awakening of Lavos which led to the destruction and alternation of his once beautiful home.