Day 24 (belated)

Metal Sonic is a cold, intelligent, aggressive machine with a superiority complex, designed as Sonic's antithesis and obsessed with destroying him to prove himself the "true Sonic." While typically Dr. Eggman's obedient enforcer, he once became self-aware and megalomaniacal, attempting to usurp Eggman and conquer the world. Though usually reverted to obedience, he retains cunning and independent action, currently displaying extreme loyalty by leading the Eggman Empire in his creator's absence. Unrelenting, Metal Sonic learns from every defeat to improve and relentlessly pursue his goals.