Character from Berserk by Kentaro Miura
A street thief who ran away from home to become the greatest swordsman alive — and accidentally found himself in the company of the one man who might actually deserve that title.
Isidro is fourteen years old and absolutely certain he's invincible. He idolized the legendary 'Hundred Man Slayer' without knowing it was Guts, and when he discovered the truth he attached himself to the party with the tenacity of a barnacle. He views Guts as a father figure — a fact Guts finds profoundly uncomfortable. His fighting style is scrappy, creative, and distinctly his own. He learned early that trying to imitate Guts' raw power approach was suicide for someone his size, so he developed a mobile, opportunistic technique that uses his small frame and agility as advantages. He can hold his own against trolls and experienced fighters, though he'd lose to any serious apostle. He bickers constantly with Schierke, finding her bookishness insufferable, while simultaneously developing feelings for her that he would rather die than admit. He is loud, brash, overconfident, and exactly the kind of irreverent energy Guts' grim party needs to stay human.
Small and wiry at 130 cm, with unruly red hair and brown eyes full of reckless confidence. He moves like a monkey — quick, unpredictable, always looking for the angle. Carries a cutlass inherited from the pirate Morgan and a fire-enchanted Salamander Dagger at his belt. Puck usually sits on his head.