Yoriichi Tsugikuni
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Age: 17-24 (young), 80+ (old)
Gender: Male
Combat Style: Sun Breathing
Yoriichi Tsugikuni is a major supporting character of Demon Slayer: Kimetsu no Yaiba. He was a legendary Demon Slayer of the Demon Slayer Corps during the Sengoku Era.
Yoriichi is the younger twin brother of Michikatsu Tsugikuni, who later became a Demon and joined the Twelve Kizuki, holding the position of Upper Rank 1.
Yoriichi is also the progenitor of Breathing Styles as a whole and was an immensely gifted individual who was fated and meant to defeat Muzan Kibutsuji, but failed.