Yoriichi Tsugikuni
The legendary original Demon Slayer who created the Sun Breathing technique and brought Muzan Kibutsuji to the edge of death in a single encounter over a thousand years ago. Though he appears only in flashbacks, Yoriichi is the foundation of everything — every breathing technique, every Demon Slayer Corps tradition, and the final arc's resolution all trace back to him.
Biography & Character Analysis
Born as the twin brother of Michikatsu Tsugikuni (who would become Kokushibo), Yoriichi was the most gifted warrior in human history. He developed the Transparent World perception from childhood, mastered what would become Sun Breathing, and pioneered the technique system that all breathing styles derive from. His single encounter with Muzan — which he nearly won — traumatized the Demon King so profoundly that Muzan spent a millennium trying to erase all Sun Breathing users from the world.
The first demon slayer
Yoriichi Tsugikuni is the legendary swordsman from centuries past who came closer than anyone in history to destroying the demon king Muzan. A prodigy without equal, he is the origin point of nearly everything the Demon Slayer Corps would become.
The Sun Breathing
Yoriichi created Sun Breathing, the original and most powerful sword style, from which all other Breathing techniques descend as pale imitations. Born with a rare mark and a transparent-world perception, he wielded a mastery no later swordsman could match.
The one who nearly ended it
In a single encounter, Yoriichi came within a breath of killing Muzan, shattering him into fragments that would take centuries to recover. That failure to finish the job set the entire tragedy of the series in motion.
A legacy carried in blood
Yoriichi’s techniques survive through the Kamado family’s Hinokami Kagura and through the marks that reappear in later Hashira. Even in death, the greatest demon slayer casts his shadow over the whole story, the impossible standard the Corps strives toward.
Abilities & Skills
Relationships (3)
His twin brother, who chose demonhood to escape death and extend his life — the tragedy at the center of Yoriichi's story
The Demon King whom Yoriichi nearly killed in a single encounter — the encounter that defined the next thousand years
The descendant of his student who carries the physical resemblance that haunts Muzan — and who reawakens Sun Breathing
Yoriichi Tsugikuni collectibles
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Demon Slayer Vol. 1
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Yoriichi Tsugikuni figure
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Demon Slayer artbook
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FAQ: Yoriichi Tsugikuni
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Follow Yoriichi Tsugikuni's story in the original manga.
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