My current ranking would be something like this, I guess.
Most of this has actually been quite consistent throughout most of the game's lifespan. I'll just comment on some recent changes.
Kirin has been my #1 since the scene with Ayane at the beach and her scene after the Molly incident is one of the best in the game, but she's been dropping a bit now that she's starting to behave more like a normal person. I'll let her keep her spot for now, but I feel like mellowing out kinda makes her lose what made her stand out.
Nodoka seems to be taking Kirin's place as the enabler character that spurs Sensei on to be a worse person, so she's been inclining a lot lately compared to my apathy towards her on release. Same goes for Haruka; I always liked her well enough, but this recent arc bumped her up two tiers. Wonder what's next for her.
Makoto has risen in my opinion quite steadily over the course of the game's life span. She has a pretty good arc, I think. And while Miku still isn't my favorite or anything, I would've probably put her in F tier at the start.
Touka will rise very sharply if we get a dommy route from her, and probably drop if that turns out to be wishful thinking. I also still have high hopes for Yasu, whichever direction that will go in the end.