Tengen Uzui (宇髄 天元 Uzui Tengen) is a part of the Demon Slayer corps and uses the Breath of Sound (音の呼吸 Oto no Kokyu) a unique breath style branched off from the Breath of Thunder (雷の呼吸 Kaminari no Kokyu) in the Kimetsu no Yaiba (Demon Slayer) series.