Tsugikuni, Yoriichi
継国 緑壱
Spoiler
Yoriichi is the creator of the first and most powerful breathing technique which all other forms branch off from, sun breathing. He was also the younger twin brother of Michikatsu Tsugikuni.
Spoiler
He was able to defeat Muzan easily, but didn't kill him because he asked the "Demon King" a question, giving him time to escape.
Spoiler
Michikatsu Tsugikuni, Yoriichi's brother, jealous of his brother's abilities, accepted Muzan's proposal and became Upper Moon 1.
Details:
- First name:
Yoriichi - Last name:
Tsugikuni













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