Isidro is a former street kid and petty thief with big dreams of becoming a legendary swordsman. He's best known for attaching himself to Guts, initially convinced he could just watch the guy fight and steal his secrets to become even stronger. Pretty naive, all things considered.
What he lacks in raw talent and muscle, he makes up for with speed and scrappiness—his small frame actually works to his advantage. He's loaded with confidence bordering on arrogance, always scheming about ways to level up and eventually surpass everyone around him, especially Guts. Eventually reality hits when he grasps just how massive the gap in strength actually is, though it doesn't totally kill his ambitions.
Alongside Puck, Isidro fills the role of comic relief in the story, providing lighter moments that balance out the heavier stuff. Fans often note that his earnest determination, even when misguided, keeps things entertaining.
Content compiled by AnimeList.moe from publicly available sources.
