The Fourth Ember Sovereign and younger brother of Bankai Akuma. Known as the strongest prodigy of his time, he was famously known for his vicious raids on enemy villages. Raion awakened Rengoku after losing his Kor Tailed Spirit. Raion Rengoku  has long black hair with a purplish tint tied into a bun, black eyes and pale skin. He wears a purple mask on the side of his head, a brown strap, gray clothes, a purple hakama with a lavender rope holding it to the waist and a plain black cloak 