Yoriichi Tsugikuni

Sun Breathing

Regarded as the strongest Demon Slayer in history, Yoriichi originated Sun Breathing, the source technique behind every other Breathing Style, and was born already bearing the Demon Slayer Mark alongside the ability to perceive the Transparent World. He fought Muzan Kibutsuji to a near-standstill and repeatedly declined the title of Hashira despite being offered it.

Yoriichi was a tall, lean, and strikingly handsome man with long wavy hair fading to red at the tips, worn in a ponytail, and calm maroon eyes. He bore an uncanny resemblance to his twin brother Michikatsu, save for a more serene expression.

Reserved and profoundly calm, Yoriichi rarely showed emotion even in the heat of battle, carrying himself with quiet solemnity shaped by immense personal tragedy.