Twin Signal: Family Game(1996)

If you want to challenge the ultimate humanoid fighting machine, be sure to bring him some chocolate!

Signal, a robot companion built for Nobuhiko, is attacked by Pulse, one the its creator's previous prototypes. Reprogrammed by Dr. Otoi's mysterious rival, Pulse is loaded down with weapons and sent on a mission by Otoi: steal the most recent robot technology, and obliterate anything that gets in his way.