placing my bets now, 50% the evil mech guy is ootori's friend, 25% he's yet-to-be named character who is in the school, 12.5% he's a rando, 12.5% he's a non-school character who is close to ootori
also if he is ootori's friend, 75% the evils will date, 25% they hate each other / be rivals
also...