Lion Ushiromiya

Lion Ushiromiya is the child whom Natsuhi Ushiromiya abandoned nineteen years ago. This person appears in the seventh game, Requiem of the Golden Witch, under the circumstances that Natsuhi accepted the child that Kinzo had given her to raise in order to prove her capabilities as a mother. It is suggested that because Lion exists, Beatrice, the Golden Witch doesn't exist, creating an alternate set of events to occur on Rokkenjima in 1986.
Later, it is revealed that Lion only exists because Natsuhi accepted Lion as her child, which has 1/2.578.917 chance of happening.

In truth, Lion is actually Kinzo's child by his daughter, Beatrice, who in turn was the daughter Kinzo had by his mistress, Beatrice Castiglioni. Lion was given an androgynous appearance. Will asks what Lion's gender is and Lion presents a retort suggesting the answer to Will's question should be obvious. Will replies that Lion looks like an effeminate young man or an assertive no-nonsense young woman, furthering the child's ambiguous gender. Bernkastel confirms that she hid Lion's gender on purpose. Because people would often ask questions on this topic, Lion admits to having a bit of a complex towards these questions.

In End of the Golden Witch, Lion's gender remains unknown, though the mysterious phone calls that Natsuhi receives suggests the abandoned child was a male. However, Lion's alternate existence, Yasu, possesses mostly female alter-egos.