A young runaway and petty thief, Isidro left home and family behind in order to become a swordsman. After Guts saves him from an attack of Kushan Bakirakas, he follows him around "to spy out his technique". Although Isidro greatly lacks in swordsman skills, he is an exceptional thrower, managing to kill two pigeons with a double-handed throw at great distance. It is suggested that he has underlying issues regarding his parents, when they are inquired about he becomes more stiff, defensive, and belligerent, and avoids the topic completely. What these issues are have yet to be revealed. He later receives from Flora the Salamander dagger, a weapon blessed by the spirits of fire which sears whatever it cuts. and also receives an inherited cutlass from an old villager as a gift. He often bickers with Schierke who finds him reckless and ill-mannered.
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