Kosui Yakei

Kosui Yakei (湖水野鶏, Lake Fowl) is a young prodigy born to unknown parents from who have moved to the. He is exceptional in an art which he has created solely by himself, titled Tatejutsu (盾術, Literally meaning: Shield Techniques) with his famed shield Kinei. His proficiency in the usage of techniques has earned him two titles which he can be identified as:  Aquarian (Mizugameza, 水瓶座) and Ganymede (ガニメデ, Ganimede).