Yoriichi Tsugikuni

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Yoriichi Tsugikuni belonged to the Sengoku Era (or Warring States period), living approximately 500 years before the main story of Demon Slayer: Kimetsu no Yaiba. He was the most powerful swordsman in history, the creator of Solar Breathing, and the first to bear the mark of the Demon Slayer.

Solar breathing It was created by Yoriichi Tsugikuni, the most powerful swordsman in history. This style mimics the sun, the greatest weakness of demons, and its movements are fluid, circular, and devastatingly powerful.

Yoriichi Tsugikuni's personality is characterized by stoicism, humility, and serenity, despite his immense power. Although he presents a calm facade and rarely expresses emotion, he is deeply kind and caring, especially towards his older brother, Michikatsu (Kokushibo). He also possesses a strong sense of responsibility, which motivated him to become a demon slayer.