Kyojuro Rengoku is the Flame Hashira from Demon Slayer Kimetsu no Yaiba, the manga and anime series about demon slayers in Taisho era Japan. His Flame Breathing techniques became widely recognised after the Mugen Train storyline put him at the centre of its climactic battles. Clips of his forms circulate as short audio memes because the combination of a shouted attack name and roaring fire effects is instantly recognisable to fans. Editors reuse them to signal a heroic surge, keeping Rengoku's enthusiastic spirit alive in edits and tributes.