Kamui's childhood friend who undergoes a personality shift and joins the Dragons of Earth. Kills Kotori, swears Kamui to kill him, and absorbs Nataku's flesh to recover. Ultimately receives Kamui's dying will, which restores his original personality.
Destined rivals bound by prophecy, culminating in a fatal confrontation that defines their shared fate.
Ep 8 identifies them as twin stars; Ep 24 depicts their final battle at Tokyo Tower where Kamui's sword breaks and he is impaled.
Transactional alliance where Fūma grants Kakyō's final wish, binding them through shared acceptance of fate.
Ep 13 shows Fūma convincing Kakyō to join the Dragons of Earth in exchange for granting his wish; Ep 17 reveals Kakyō wants Fūma to kill him.
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