Karel is a feared, and legendary swordsman from the plains of Sacae, appearing as the psychotic "Sword Demon" in Blazing Blade, and the sagely "Sword Saint" in the Binding Blade. Karel is the brother to Karla, and, as such, is the uncle of Fir. Karel, in the Blazing Blade, has a love for combat, and is fixated on his own bloodlust, having killed all in his family apart from Karla for the family sword (Possibly the Nameless Blade.) Still, despite his tendencies, Karel is shown to retain a sliver of his human conscience when spoken to in his supports.