Karel is a swordmaster who appeared in Fire Emblem: The Binding Blade, Fire Emblem: The Blazing Blade and Fire Emblem Heroes. He is a Sacaen swordmaster who has had two titles over the course of his life: The bloodthirsty Sword Demon, and the wise Sword Saint.
He is voiced by Bryce Papenbrook.
Fire Emblem: The Blazing Blade
Karel was born in a family where "only one can wield the sword", and killed each other over it, Karel cut down the rest, save for his sister Karla, who he didn't see as a threat at the time. Afterwards, he went and slew various strong opponents, such as a rock giant named Kelles who was said to be three times the size of a regular man, and a wizard from Ilia who could freeze blood in a person's veins. This earned him the fearsome reputation as the "Sword Demon". He encounters Eliwood and company in "Pale Flower of Darkness" while seeking opponents to fight, and joins his group in order to observe his skill.
Fire Emblem: The Binding Blade
Karel changed significantly during the twenty year timeskip between The Blazing Blade and The Binding Blade, as he traveled across the lands with a new title, the "Sword Saint", and resolve, having finally found peace in himself after these years. He retired to a life of seclusion in a village when he grew tired of fighting. He offered to join Roy and his allies at his niece Fir's request.
Fire Emblem Heroes
Karel is a playable unit in the gacha mobile game, Fire Emblem Heroes. He was added to the roster in March 2017, under the "Blazing Shadows" banner.
Super Smash Bros.
In Super Smash Bros. Ultimate, Karel appears as a advanced support spirit.