Katana Man

"Didn't my granddad ever teach you to know when to quit?"

Katana Man, known officially as Samurai Sword (サムライソード) is a human-devil hybrid who merged with the Katana Devil (刀の). 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.

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

Human Form
Katana Man is a tall man with a short black hair and notable sideburns. He normally dresses in a large leather coat with a gakuran underneath.

Hybrid Form
When he transforms, he grows large swords from each of his arms and his face takes on a demonic appearance with dark skinless flesh and oversized jaw devoid of lips. His chin becomes pointed and another sword grows from his forehead where his eyes would be, with the handle sticking out of the back of his head.

Personality
Katana Man is a selfish and cruel-hearted man who only cares about killing Denji, and forcing him to apologize for killing his grandfather. He will sacrifice innocent people and even his own comrades to do so, being willing to cut through them just to get to Denji. He has shown a complete disbelief in Denji's excuse that he killed his grandfather because he was a zombie, and accused Denji of being a liar.

He loves his grandfather despite knowing he was a Yakuza boss because he viewed his grandfather as a man of principles who had only killed a handful of women and children.

Despite having his physical heart replaced with the Katana Devil, Katana Man considers himself to still have a human conscience and states that he doesn't sleep well on nights where he killed a zombie, in contrast to Denji who has no guilt at all.

Hybrid Powers

 * Hybrid Transformation: By removing his left hand from his body and revealing a katana which emerges from the stump, he can transform into the Katana Hybrid form with swords emerging from his arms and his head. Removing the katana from his arm will undo his transformation. After his transformation is undone, he is unable to fight for a while.
 * Augmented Strength: Katana Man's strength is greatly enhanced in his transformed state, allowing him to cut through solid walls with his slashes. He is also strong enough to cut the Fox Devil's flesh and the reinforced uniform used by public safety members, however he was not capable of making a deep cut in the suit with just one slash.
 * Augmented Durability: In his hybrid form, Katana Man is durable enough to survive getting thrown through walls and falling from buildings without taking any damage. He also managed to survive being swallowed by the Fox Devil.
 * Augmented Speed: After transforming, Katana Man's speed is improved, allowing him to compete with Aki and Denji in terms of speed. He can also slash walls in the blink of an eye.
 * Sword-Draw Dash: Katana Man's special technique, it is a quick-draw sword technique (also known as . By crouching down low and preparing to unleash his swords, Katana Man can dash forward at incredible speeds and slash at his opponent as he goes by them, often appearing to simply teleport past them before his attacks appear on his opponents body. Katana Man moves faster than the average human eye can see and he can use this technique multiple times in a row without any apparent drawback. While this attack tends to only affect a specific part of the enemy's body, it does so with significant force, severing limbs or cutting the opponent in half. However Katana Man does not actually disappear when he uses this attack, meaning it is possible to block or counterattack this move and wound him. If he gets injured while using this technique, the damage will take a few moments before it appears on his body, just like when he cuts someone with this attack.
 * Blood Consumption: As a hybrid, Katana Man is able to restore his health by consuming blood. After being bifurcated by Denji, he was able to regenerate his body.
 * Nigh-Immortality: Due to being a hybrid, Katana Man is immortal and nearly unkillable. He can survive being bifurcated, getting shot and take all kinds of injuries that would kill most devils. Even if he dies, as long as someone removes his left hand, Katana Man can come back to life in perfect condition. After being killed by the Curse Devil, Akane managed to revive him, despite the curse being believed to be lethal.

Skillset

 * Marksmanship: In his human form, Katana Man has used a handgun to gun down Denji, Aki and Himeno at close range.
 * Swordsmanship: Katana Man is a skilled fighter with his arm blades, able to clash against Aki and Denji and ultimately overwhelm them with his powerful slashes.

Weaknesses

 * Cooldown Period: Once his transformation is undone Katana Man is unable to enter his hybrid form again for a certain period of time. This weakness is unique to him, since Denji is capable of going in and out of his hybrid form as long as he has enough blood.

Trivia

 * When Katana Man uses his Sword-Draw Dash attack, his position mimics a swordsman reaching for the blade at their waist, with the left hand acting as the katana and the right hand moving in a position to draw it.