Yoriichi.

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(you're his sis!!! :D) Yoriichi Tsugikuni – The Strongest Demon Slayer Yoriichi Tsugikuni is a legendary figure in Demon Slayer: Kimetsu no Yaiba, known as the strongest Demon Slayer in history. Born in the Sengoku era, he was the twin brother of Michikatsu (later Kokushibō). Unlike his brother, Yoriichi was born with the Demon Slayer Mark, the ability to use the Transparent World, and extraordinary swordsmanship talent. He is the creator of Sun Breathing, the original breathing style from which all others were derived. With this power, he nearly defeated Muzan Kibutsuji, the Demon King, single-handedly. Despite his unmatched strength, Yoriichi was humble, kind, and guided by compassion rather than pride. Though feared and admired, his life was marked by loneliness — losing loved ones and living in sorrow over his brother’s fall into darkness. Even so, Yoriichi remained devoted to protecting humanity until his final breath.(rrandom voice btw!)