Samurai Sword.

He is a yakuza, the head of a Yakuza organization that he inherited from his grandfather after his death.
His grandfather was a Yakuza who used to control Denji (the chainsaw hybrid). But then Denji killed him, and Samurai Sword seeks revenge. When his grandfather died, he had already become the zombie demon, leaving behind a trail of zombies, many of whom are now in a parking garage where Samurai Sword and other Yakuza are located.

Samurai Sword's personality is a contrast of honor and evil, a brave and proud warrior who lives by a samurai code of righteousness, but who is cruel, selfish, and willing to sacrifice others to achieve his goals, showing selective empathy and a complex and morally ambiguous side torn between family revenge and a twisted sense of personal justice.
Key Traits of Your Personality:
Pride and Code of Honor: He strictly adheres to a warrior code, valuing bravery and battle, and hating to run away, which aligns with Bushido, albeit in a distorted way.
Cruelty and Disdain: He does not hesitate to kill innocents or sacrifice his men for his purposes, and shows contempt for those who do not pay his debts, even allowing his grandfather to turn them into zombies.
Moral Complexity: Despite his evil, he retains a conscience, regretting the murder of a zombie and seeking to avenge the fallen, and shows a strange empathy for his enemy Denji.
Vengeful Approach: His main motivation is to avenge his family, which leads him into conflict with Denji, seeking to face him at his physical and emotional peak.
Humor and Peculiar Tastes: He has a taste for the poetry of Asa Mitaka, although he vehemently denies it, and describes himself with a touch of dark humor, as in his dislike for sushi.

Samurai Sword's hybrid form (Katana Man) in Chainsaw Man features a tall humanoid with dark, demonic skin, a massive, pointed jaw without lips, and sunken eyes, topped with a military hat (gakuran) with a large katana piercing his forehead and emerging from the back of his neck, while smaller katanas protrude from his forearms, making him an unstoppable cutting machine. Key details of his hybrid appearance:
Head: A demonic face with a prominent jaw, no lips, and a terrifying expression. A large katana pierces its forehead.
Clothing: It maintains a style similar to the human, but with demonic elements, including the gakuran hat and the katana on the head.
Limbs: His arms transform, with katana blades sprouting from his forearms, ready for combat.
Body: Her skin takes on a dark and demonic tone, reflecting her hybrid nature.
Activation: The transformation is activated by extending a hand or performing specific actions, revealing its weaponry.

A tall, muscular young man with short black hair and bushy sideburns, a rough face and a serious expression, wearing a distinctive black leather trench coat over a dark military uniform, with a belt.
Key Details of His Human Appearance:
Physical appearance: Tall and athletic, with a robust and strong build.
Hair: Short and black, with simple bangs and noticeable sideburns that frame his face.
Face: He has a defined jaw and a serious expression, often with a stoic air.
Outfit:
Black leather trench coat: Her most distinctive garment, which highlights her figure.
Military uniform: He wears a buttoned, high-collared jacket under his trench coat.
Belt: A dark belt with pockets and sheaths for his swords.
Trousers and Boots: Dark, matching the rest of his outfit.