Yoriichi Tsugikuni

Yoriichi Tsugikuni was a member of the Demon Slaying Corps during the Sengoku Era. He was the young twin brother of Michikatsu Tsugikuni, who became a demon, Kokushibo.

Abilities and Powers
He is arguably the strongest Demon Slayer and swordsman in the entire history of Kimtesu no Yaiba's Japan given that he was the one who cornered Muzan and had him on the verge of death before Muzan managed to escape. Shortly before his death and at least 85 years in age, he battled his older twin brother, Kokushibo (UM1). He quickly gained the upper-hand in the battle, even slitting Kokushibo's throat before he finally died standing up, unscathed.

Breath of the Sun ({{Ruby|日|ひ}}の{{Ruby|呼|こ}}{{Ruby|吸|きゅう}})
None of the techniques of the Breath of the Sun have been directly shown. However, Yoriichi in his old age is shown to have used it in his battle against Kokushibo 400 years prior to the present time of the story.

Quotes

 * In Chapter 174 prior to dueling his brother with the intent of killing him, he states: "My sympathies my brother."

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Кокушибо