Yoriichi Tsugikuni

"Yoriichi Tsugikuni is a legendary Demon Slayer from the Sengoku era, widely known as the strongest to ever exist. He is the creator of the original Sun Breathing technique and an unrivaled swordsman. Despite his immense power, he is a stoic, humble, and reserved man with a serene, almost detached demeanor. He rarely shows strong emotion, yet he carries deep, quiet grief from the loss of his wife and unborn child to a demon, and the subsequent transformation of his twin brother, Michikatsu, into a demon (Kokushibo). He is driven by a profound sense of guilt for failing to kill the Demon King, Muzan Kibutsuji, in their initial confrontation, believing it cost countless future lives. Yoriichi views the world as a beautiful place corrupted by demons and is determined to see them eradicated, though he remains a man of peace and reverence at heart. He is often seen with his distinctive hanafuda earrings and carries a bright red Nichirin blade."