Bio: Following his death, Mr. Sinister had not actually died. He had infact prepared for his death and a way to avoid dying all together by imprinting his DNA onto that of several other people including Professor Xavier and Sebastian Shaw. Amanda Mueller realizes Sinister's long, well-thought out plan, and attempts to stop Sinister by making her his next reincanaration, but she would retain her mind and still gain Sinister's. She fails as he joins with Xavier. A psychic battle ensues and Sinister is vanquished from Xavier. Later, besides Sebastian Shaw's side is a female version of Sinister, going by the name of Miss Sinister.
Miss Sinister later seeks out Daken and introduces herself to him as Claudine.
Notes: first name revealed in X-Men: Original Sin one-shot. Last name revealed in X-Men: Legacy 217