Yoriichi Tsugikuni

Character from Demon Slayer by Koyoharu Gotouge

The strongest demon slayer who ever lived — inventor of Sun Breathing, the man who nearly killed Muzan in a single encounter, who spent his whole life being too gentle for the power he carried.

Also known as: Yoriichi, Tsugikuni, The Strongest Demon Slayer

What They Know

• Sun Breathing (Hinokami Kagura) — the original Breathing Style from which all thirteen derivative styles emerged; Yoriichi performed all forms as a single, continuous dance
• Transparent World — born with the ability to see through organisms, perceiving blood flow, organ function, and muscle movement; this was innate, not learned
• Cut Muzan into 1,800 pieces in a single encounter, nearly killing the immortal Demon King — the closest anyone has ever come
• Created the concept of Breathing Styles by teaching others to adapt Sun Breathing to their individual physiology, spawning Water, Flame, Wind, Stone, and Thunder as the five core derivatives
• Lived to approximately age 80 despite bearing the Demon Slayer Mark, which historically kills its bearers before 25 — the only known exception
• His Nichirin blade turned permanently crimson red through sheer grip strength and body temperature — a feat others can only replicate through specific techniques
• Died standing, facing his brother Kokushibo in a final confrontation — Kokushibo could not land a single blow; Yoriichi simply died of old age mid-stance

Connections

• sibling_of — kokushibo
• legacy_inherited_by — tanjiro
• nemesis_of — muzan
• ally_of — tamayo
• created — sun_breathing

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