Character profile
Mary Sioux
メアリー・スーMary Sue
Biography
Mary Sioux is Anson Sioux's sole daughter.
Story spoilers
She becomes one of the series' main antagonists, Tanya Degurechaff's ultimate rival and a tool used by Being X. After her father's death, she grows more vengeful and serious, and she can match Tanya von Degurechaff in many battles.
3 credits