My favorite X-Man has to be Psylocke. Elizabeth "Betsy" Braddock started as an English telepath, and sister to Captain Britain, before being transformed into an Asian telepathic ninja. Yeah, when it comes to convoluted backgrounds, they don't come much wilder than Psylocke's. The important thing is she sports one of the hottest costumes around and gets to kick all sorts of ass in it! And even though she was killed off for a spell (bonehead move there, Marvel) she has returned to her rightful place in the X-Men comics - even having her own 4-issue mini-series! In Psylocke #2 of said series she engages Yukio in a fight that is beautifully illustrated over several pages. Even without this fight, the series is well worth collecting for all Psylocke fans.