Zenitsu Agatsuma is one of the main characters in Demon Slayer: Kimetsu no Yaiba, the anime adaptation of Koyoharu Gotouge's manga that began in 2019. Known for his loud fear, comic panic and surprising strength when using Thunder Breathing, he quickly became a fan favourite and a frequent source of reaction clips. Short Zenitsu sounds circulate widely on soundboards, social media and anime edit communities, where his distinctive voice is instantly recognisable even without a picture. That combination of humour, drama and familiarity keeps the clip useful for creators years after the series first aired.