Flandre Scarlet

Flandre Scarlet is the younger sister of Remilia and the "dirty little secret" of Scarlet Devil Mansion. Because of her unstable personality and incredible destructive power she lives in the basement of the mansion. She's immune to Holy things and has incredible physical strength; her sister has ordered her not to leave the mansion for nearly 500 years. She knows little about the world outside and, until the heroines arrived during the Extra Stage of Embodiment of Scarlet Devil, she has had no substantive contact with any humans other than Sakuya.