I want to say that this list is like the antithesis of my own list just because of Kirin, and while I'm not trying to yuck your yum, especially because you state the notion that Kirin is 'abandoning' her previous ideals and leaning more into a romance route and that loses her points which is something i agree with.
I'm genuinely curious? You are someone rooting for the worst parts of all the harem and characters? Is it from a story perspective or a fetish perspective or both?
Because i agree with you i don't like Kirin going to a 'normal girl route' but that's because i already hate Kirin, i don't want to like her, i don't like her methods and anything about her. I would very much rather take Karin on dates and rub it in her face to then just have hate sex with Kirin later because that's her role. In my eyes she is F tier because 'That' is all she is and she's not allowed to be more.
But you're arguing that she's S tier as that and her trying to be more lowers her. While i'm arguing that she's F tier and trying to be more might raise her up lol.
Interesting question.
In the end this game is about a teacher grooming his 15-year-old students and trying to have sex with as many of them as possible. I tend to like it when characters throw this back in your face instead of skirting around it. Kirin calling Sensei out for his behavior while also enabling it is both arousing and interesting in terms of what it forces Sensei to confront. She's like the devil on your shoulder trying to get you to sell what little is left of your soul:
"Are you willing to be my partner in crime? Do you want to watch the rest of the world burn while we fuck like rabbits in my parents' bed?"
"The reason I like you so much is because it's interesting watching you set aside your 'morals' in exchange for temporary bliss."
"You're sick... Getting hard from being confronted about all the terrible things you've done."
"That's right, Sensei. Deny it. Deny it and take those feelings out on me. Be whoever you want to be outside this room, but show
me the real you. No one else. They can't handle it. But I can... [...] Show me the you who pushes all of it away because it's easier when you don't feel anything."
"You can do whatever you want, to almost whoever you want, and I'll still be here for you to pin down and have your way with. We're in this together..."
I really enjoy that sort of "reverse corruption" dynamic where the girl who is in a sense a target of the guy's darker impulses is the one who actually goes and encourages them. Kirin considers herself and Sensei to be 'partners in crime' and is openly aroused by the thought of Sensei doing terrible things to other girls. So I kinda figured there'd be a point where you could choose a route more influenced by her perspective where Sensei really stops trying at all and just becomes totally depraved.
This is currently looking more like Nodoka's thing, but I like Kirin more for this role than Nodoka, because Nodoka seems like an actual sociopath and feels less 'real' and vulnerable than Kirin. With Kirin, like Sensei, there's always that small part of her that knows she shouldn't be doing this, but which she surpresses because it's easier not to feel anything. So as she pushes Sensei to the point of total ruin, there's the sense that she is also dragging herself down with him. I like that a lot. (Or liked that, I guess, since that small part of both of them actually seems to have become stronger rather than weaker over time.)
Aside from all of that, I guess I also like her for the more simple reason that I'm a masochist and like assertive girls who insult me.
As a side note, this just illustrates how bad tier lists are for representing one's full thoughts on the subject. As another example, Sara and Io are in the same middling tier, but Io is someone I quite like who gets dragged way down in the desirability ranking by being asexual while I simply don't feel very strongly about Sara at all.