Needs more Marco and Mr Moore! They're hot
There's also a guy you can pick up on that sugar daddy app, I think it's Charles (the old guy). Although I haven't played the latest content there and can't remember the existing content that well, that's probably going to be a bit of a darker route.
If you're looking for wholesome guys, Marco (the male room mate) is probably going to be THE wholesome romance in this game, and Mr Moore (the teacher) is pretty tame thus far (and he doesn't have a douche-bag personality. Yet, anyway). There's also Darren (the nerdy guy), but there hasn't been any scenes with him yet, so I don't know how the romance with him will go, but it will probably be on the wholesome side, too.
Not really sure about the girls as they don't really interest me (aside from maybe Lei).