I speak for several fans of Street Fighter IV when I say that Abel's theme is pretty f**king sweet.
Which makes me wonder why I've never seen anyone do an actual remix of the song. I don't even care what genre it is as long as it's recognizable.
If you're looking for an example, how about a piano sonata? Maybe play on the sympathetic aspect of Abel, not knowing his past, wondering what he is.
Or just make it sad sounding, kind of like this old MM5 remix from 2002: http://ocremix.org/remix/OCR00781