First Apparition: EP7
Lion is a member of the Ushiromiya family who exists only within the alternate world shown in Requiem of the Golden Witch as a result of Natsuhi deciding to keep the baby Kinzo offered her. Lion is given an androgynous appearance out of uncertainty for the baby's true gender. As the first child of Krauss and Natsuhi in this world, Lion is the heir to the Ushiromiya family and well-liked by the rest of the family, including Kinzo, in part of a softspoken and good-mannered upbringing. Lion is in fact Kinzo's biological child together with his secret mistress Beatrice. Lion becomes Willard H. Wright's partner during his investigation of Beatrice's death, becoming close with him and even leading to a running gag in which Lion would pinch Will's buttocks whenever he would act in an disrespectful manner.
Informations Source: Wikipedia