McCool Shay (マックール・セイ) is Princess Rubiria's personal guard. He's also called Boy Knight, by Rou as a nickname.
McCool has blonde hair and blue eyes. He is normally seen wearing armor and a red cape.
McCool is loyal to Rubiria and prioritizes her safety at all times.
He serves Princess Rubiria.
He trusts Rou after the latter helped save the princess.