Kizuoa is a young, 274 year old dragon who is not only Henry Kage's Inner Dragon and partner, but also the son of the Dragon deity Bahamut. A hatchling who inexplicably came to Bahamut via a dragon egg said to be given by God Himself, Kizuoa was trained since he was a child. He was sent to do missions that involve scouting, attacking enemy camps, and went through a Rite of Passage to prove his dragonhood, from which he became a warrior. As he was an adult, his father, sensing that evil dragons would come and damage the universe, he sent Kizuoa to intercept one evil being by the name of Kizu and curse him with a special curse that will allow him to slowly drain the cursed's life energy whenever they tap into his power. Eventually, Kizuoa was passed down to Henry and after his Clan elder removed the curse, he trained with Henry, from which they developed a very strong bond and partnership. The tribal-like markings on Henry are from Kizuoa himself, as he had chosen him to be his tamer and with the markings, his own power, and the mastery of Aura with the training he went through with Henry, they both have become very powerful. Throughout his life, he's been by Henry's side like a father figure, protecting and taking care of him through his difficult life. As time passed and as Henry and Kizuoa went through many adventures, he has become one of the most powerful and respected dragons of all dragonkind; any who sees him knows him as the son of Bahamut and as the next in the heir for the throne of being the Dragon King.