Demon Slayer: Kimetsu no Yaiba's Entertainment District Arc revealed a lot of new information; starting from the unveiling of Upper Moon six to some explanation of the mystery behind Tanjiro’s Sun Breathing style. In the Entertainment District Arc, the series subtly depicts a mysterious character — a Demon Slayer, Yoriichi Tsugikuni, through Kamado Tanjiro, using some eye-catching foreshadowing.
Yoriichi Tsugikuni is a supporting character in the series, but he’s central to the culture-rich history of the Demon Slayers. However, little information has been shared regarding this mysterious Demon Slayer in the anime. Regardless, most fans are intrigued about the character's background since Muzan, and some of his blood-linked minions expressed visible fear after encountering anything that closely resembled Yoriichi.
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Yoriichi was a member of the Demon Slayer corps. He wore Hanafuda earrings like Tanjiro and is revered as the first breath user. He was the creator of the legendary Sun Breathing style, the style which other breathing forms originate from. Yoriichi is the younger of two twins who appeared weak after his birth. However, it appears that wasn't the case. He only appeared weak since he was a quiet child with remarkable emotional intelligence. At some point, everyone thought he was deaf due to his unresponsive nature. Even his elder brother failed to see Yoriichi’s true strength until much later. Yoriichi was born with the Demon Slayer mark on his forehead, proof of his immense strength and skill as a fighter. After Yoriichi's father discovers his strange birthmark, mistaking it for a bad omen, he threatens to kill his son but is prevented by
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