I generally like the characters, but there's significantly less development of the characters than there is the actual puzzles. I'm still trying to figure out how to get out of the lab, and now that I've been turned squidbunny I fear I'm going to have to load an earlier save because it soft locks you out of the scanners.
I feel like you get the most face time out of Yuri since she's doing the class rep thing to get your registration all squared away, but honestly I can't say more until I figure out how to get one of the girls out of the dream world.