The Real Dark Lily
This unknown warrior appeared in OiramOiram12345 and the Dark Star X, where she defeated Dark Lily and her sword took some of her dark energy (that may be the reason she has the eye of a doppleganger) then left. After Mario defeated Dark Bowser X, she almost revealed her name when she was punched by Lily and the movie continued. She looks like she has the eye of a doppleganger after part 15 and the rest is normal.

Lilyncookies finally revealed her name to everyone on June 16th 2012.