Kyrie Ushiromiya
Rudolf's second wife. She is also one of Rudolf's business partners, always assisting him in shady dealings and keeping him in line when he gets out of hand. Kyrie and Battler have bonded more as close friends with a sibling-like relationship rather than mother and son, with Battler going as far as always calling her "Kyrie-san." She is known for her "flip the chessboard" mentality, influencing Battler in this regard. She had actually dated Rudolf long before his first wife Asumu, who she envies for marrying Rudolf while she was still going out with him. They were pregnant at the same time, though Kyrie's son was believed to have been a stillborn when Asumu gave birth to her son Battler.