Jibaku Ou, also known as King Jibac, acts as spirit guardian of Doedicos (12th World) and shares a direct bond with King Bucky, the twelfth Great Child of Doedicos. He inhabits King Bucky's castle and first manifests before Bucky and his companions in an immense, formidable size. Upon defeat by the combined efforts of spirits Jibac, Bambi, and Bakuzan, he transforms into a diminutive spherical form resembling other spirits, marked by a distinctive crown and cape.

His pivotal narrative function centers on unveiling crucial backstory: he discloses Bucky's lineage as son of King Bucky and recounts antagonist Slash's assault that froze Doedicos and its inhabitants—including both King Bucky and the young Bucky. Jibaku Ou further reveals that young Bucky was later freed from the ice, stripped of memories, and teleported to Primas (1st World) for protection. After this revelation, he implores Bucky to succeed his frozen father as Doedicos's Great Soldier. Bucky rejects the role, scorns his father, kicks the ice encasing his former prison, and departs for the Needle Tower.

Subsequently, Jibaku Ou observes King Bucky's release from the ice after Bucky temporarily overpowers Slash. He witnesses the final battle where Bucky wields a sword fused with the power of twelve spirits to annihilate Slash.