I guess if no one else then Stan and potentially Wade are up for a makeover. For Emma, it could go in two ways, given that Ian can provide input whether he likes her dressing more girly or focus on sex appeal, and Emma reacts to it.
The most obvious development is the Nun Ivy, ofc.
Stan seems like he might finally be getting a glow up if Lena has been patient with him. That's been a long time coming, but there has recently been a lot of talk from him about eating healthier, going to the gym, and having a personal trainer.
Wade is a little further off I think since he just made up his mind with regards to Cindy, so a little more time might need to pass unless we have a bit of a time skip. If he made peace with the breakup we could see him getting back into shape, or if he raged he could fall further into depression and get even worse looking.
I doubt Perry will change much, but depending on how things go with Emma and at the cafe there could be an excuse for some sort of change.
Robert, Axel, Mike, and Jeremy are unlikely to have any sort of appearance change other than maybe an wardrobe update. Or another black eye in Robert's case.
Ian can get even more muscular and / or vascular if he's been training hard and has had success in the MMA tournament. Or more schlubby, with a matching appearance to Perry or heaven forbid Stan, if he's been played as a loser. There is also still the potential of facial hair and tattoos for him likely dependent on his chad level. We also know that possibility exists because of the placeholder variables that were discovered in the code.
Louise is going away for some time, so she can easily have a change while away with her parents, but I doubt much would change with her. Same can be said for both Cherry and Ivy, both have remained fairly consistent through the whole story and there hasn't been a major plot beat that would really shake up their personality and therefor how they express themselves.
Cindy has been away for some time too. She's mentioned going to the gym more to better match the model aesthetic. I doubt she would have much of a makeover, but I could potentially see her having a bit of a tan after spending so much time out in the sun modeling if EK really wanted to mix it up with Cindy.
Allison has been the one to change throughout the game, but we haven't actually seen her in person since her last "upgrade."
Holly obviously had a development this last update. So another wardrobe update for her, tattoos / piercings and a new hairstyle / hair color to match that major change. Even on a none slutty route the release of her new novel is a good enough excuse that she can at least update her outfit or hairstyle to match her growing success as a writer.
Emma has had a lot of discussion recently with both Ian and Lena about her appearance, with both being able to encourage her in differing ways about her appearance. Then there is whatever is about to happen with Seymour as well. All of this points towards a potential appearance update.
Lena, much like Ian, also has a lot of potential different direction her appearance could go. If she's been dedicated to Stalkfap, her clothing has already gotten closer to matching Ivy's, but we could get another update. If she's Seymour's muse she thinks to herself the importance of her appearance and will automatically start working out, so a potential _fit flag for Lena can be used so that she has a specific sprite used similar to Ian's _fit flag. She has a few more tattoos and piercing options as well from the placeholder tags as well as potentially a boobjob.
All of this is to say that it just feels like we're close with plenty of excuses for most of the cast to get overhauls if EK really wanted to do it. Most characters are set up for a change and now would be a good time to do it as our perspective as players has been away from most of them while we've been at the beach house or with Lena on her travels with Seymour / Ivy.
Or like I said, I'm just gaslighting myself into thinking major appearance changes are coming for the cast.
