Kyojuro Rengoku is the Flame Hashira in Demon Slayer: Kimetsu no Yaiba, and his Fifth Form, Flame Tiger, is one of his signature Flame Breathing techniques, unleashing a blazing, tiger-shaped slash. The technique became widely recognised through the Mugen Train story, where Rengoku's fight made him a fan favourite and cemented his fiery, determined style. Since then, clips of his attacks have circulated widely in anime edits and soundboards, where this short, high-energy effect is reused to signal overwhelming power and a heroic final push.