Isidro is a secondary character in Berserk and a non-playable character in BERSERK and the Band of the Hawk. He is a boy who dreams of being a swordsman. He is first seen on the run from bandits after his food, but Isidro tricks them into eating the toxic food. While the bandits are killed by Kushan scouts, Guts saves the thief who later travels with the Black Swordsman and becomes his student in swordsmanship.