i said this a few times throughout these last few years, i think oni should implement some sort of role play with the girls. kinda like a mini side quest of sorts.
basically make each girl has a diferent "mechanic".
Rogue- can stay having her dependency, it makes sense with her story and all that.
Kitty- could have some petplay, possibly LIGHT furry(using cat ears, furry bikini and gloves and finaly a tail buttplug. could even develop a special cumming scene where the player cums in a cat food tray, and tell her to "drink her milk" or something like that.
Emma- since she is used to being a Dom, we could play around with making her a sub instead, and she could develop some pleasure from being obedient for once.
X-23- since she is immortal, she could become a masochist, so going hard on her, would turn her on. could add a mechanic for candle play or even whipping.
Jean- she would probably be the most complex, but oni could add a double personality mechanic, basically make 2 chars, using the same model, say she is developing the phoenix persona, and we can help her control it and "return" to having a more passive and angelical personality, or have her open up, and embrace that more brutal and agressive side. could even implement one personality having an easier time befriending some of the girls, like "J" for Rogue and Kitty, while "P" being better with Emma and X-23
Storm- she could become an exhibitionist, so we would have her do things in the open, maybe have her teach while her face is covered in cum for example, or using a vibrator while teaching.
Jubilee- this one is the hardest, but maybe add some cumplay with her, since she has a problem controling her powers, we could help her get used to it, maybe having her always carry a vial, and going for a more "needy" rogue, maybe have her be the opposite of the other girls, in that, she DOESNT want to have anything physical with us at first, but instead wants to pay us for our cum, with us easing her up, and making her open up to experiment and be more sexually open.
to me, not only would this add alot of content, it wouldnt even be that hard to implement. and would make each girl feel trully diferent from each other, even if they all end up doing the same things in the end.