Chainsaw Man Katana Demon

He is the primary antagonist of the titular Katana Man arc and a minor antagonist in the Control Devil arc.

Katana Man known officially as Samurai Sword is a human-devil hybrid who merged with the Katana Devil. His grandfather was the Mob Boss killed by Denji and because of that, he teamed up with Akane to get revenge on Denji and steal his heart.