I haven't played Polar Night yet, though one of my friends recommended it to me recently.
I also get really nervous asking people for permission to use their characters and stuff, so I just stuck with people I'm either friends with or knew well enough to feel comfortable with asking ^^'
Caijoru and Meimaru were a lot of fun to write here <3
I can't recommend Polar Night strongly enough. It's complete enough for a satisfying playthrough. The characters are especially well developed and interesting, particularly the painfully timid wolf electrician (whom I'm afraid would have freaked out and chain smoked the whole time in FbW). Allowing for taste, I don't think I've seen such masterful art in a VN, and the writing is also top-grade.
Along with 9:22 and FbI, it's one of the three VN's I really care about and feel good about recommending.