Katana Man

Katana Man, real name unknown, also known as Samurai Sword (サムライソード, Samurai sōdo) is a human-devil hybrid who merged with the Katana Devil. His grandfather was killed by Denji and because of that he affiliated with the Gun Devil to get revenge on Denji.

He is the primary antagonist of the titular Katana Man arc.

Personality
The Katana man is selfish and cruel. He only cares about killing Denji and will sacrifice many innocent people and comrades to do so.

Abilities
Katana Devil Transformation: By removing his left hand from his body and revealing a katana which emerges from the stump, he can transform into the Katana Man form with swords emerging from his arms and his head.