For fleshing out the characters in a somewhat easy way, I think a few more events such as the Halloween party (not necessarily with new looks) or the dates would be nice, to showcase the girls different personalities - and how they change, maybe. Like training together in the danger room, lab hours, going clothes shopping, a walk around the Mansion, going jogging in the nearby woods, a pool party, Attack on the NTR-Sentinels ... you know, ordinary stuff.
Also, I'm fine with Squirrel or Gwenpool. Wouldn't mind Spidergwen, Negasonic or fucking Sue Storm either.
Actually, fuck it, let's go wild and smash Shehulk.
I absolutely trust Oni to give just about any character a sexy look.
But, hear me out, there are two important points to consider: Psylocke's booty.
I rest my case.