Damn, now that I think about it, this is somewhat funny:I may even have been an evil man, and ..
If the devs ever want to throw us a curveball and add in an 'Evil Null working for the brotherhood" path?
I am not sure they'd need to change that very much but add a plethora of alternative internal MC monologues and conversations with the girls.
Next to everything below a "leaving for Magneto's base and taking all your smitten GFs with you to work for him" plot could also be played out as an evil infiltrator who got immune to mindreads and works on disrupting the young heros with internal strife and turning their daily life into a raging cauldron of jealousy and depravity.