Kydoimos is a godboy that goes to MOA. Nothing else is known about him except that he's friends with Makhai.
The only detail to how he looks is that he's beefy.
Kydoimos is one of Ares' cronies, always following him around, laughing at his jokes and agreeing with whatever he says. He will bully any godboy if he gets the chance, and is always seen with his buddy Makhai. He is intrusive, as seen in the book Persephone The Daring when he and Makhai were spying on the girls at the all-girls sleepover.