Ruka Rengoku is a fictional character introduced in the hit anime series "Demon Slayer: Kimetsu no Yaiba". However, he doesn't appear in the series as a significant character; instead, he is best known as the younger brother of the more prominently featured character, Kyojuro Rengoku.
Kyojuro Rengoku is the Flame Hashira, one of the highest-ranking demon slayers in the series. His younger brother, Ruka Rengoku, is known to be frail and sickly. Despite his brief appearance and limited backstory, Ruka Rengoku's character helps flesh out Kyojuro's character and backstory, giving audiences more insight into Kyojuro's personal life.
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