Head canon for tpbm game: Sometimes when he's bored and lonely, Achilles will use his quirk to summon an army of zombies. He'll make them chaotically dance together and laugh at the outcome. It's unfortunate though that this only lasts a few minutes before the zombies die again and Achilles is left lonely with his headache. He'll then slink away into the darkness seeking relief and release elsewhere. Once he used the dancing zombies to try to impress his date. He never saw that person again. They'd looked pretty pale and creeped out by the spectacle.