Shūkurō Tsukishima

Shūkurō Tsukishima is a Fullbringer and a former member of the group Xcution in Bleach. He serves as one of the major antagonists during the Lost Substitute Shinigami arc (also known as the Fullbring arc).

Appearance: He's an extremely tall, slim young man with shoulder-length wavy black hair, brown eyes, and a distinctive long vertical scar running along the side of his left eye (from a childhood injury). He typically wears a long-sleeved collared shirt (often white) with suspenders and dark pants, giving him a somewhat formal yet casual look.

Personality: Tsukishima is calm, cold, collected, and often appears carefree or even polite on the surface. However, he's highly calculating, manipulative, and sociopathic — showing little to no remorse for the emotional or psychological harm he causes others, and he frequently mocks people in a composed manner.

Powers: His Fullbring, called Book of the End, manifests as a bookmark that transforms into a katana-like sword. It allows him to "insert" himself into the past of anything or anyone he cuts, letting him manipulate memories (making people believe he's always been a close friend, family member, etc.), alter events, or even gain knowledge of someone's history and weaknesses. This ability makes him incredibly dangerous in both combat and psychological warfare.

He's widely regarded as one of the creepiest and most unsettling villains in the series due to how his power twists relationships and reality itself.