It looks like I'm basically the only one who still likes Izumi at this point. She's manipulative oc, but what you gonna do if you're smarter than anyone else in the group trying to push things towards your advantage? The moral will obvs. be that you shouldn't do that, but I still like her character-design.
No, I like her too. I like that she flawed but not like some total bitch-senpai with malice. I hope she will accept situation and start to be a better person, like Nanaki trying to. I think that people just exaggerated for the sake of jokes when called her yandere, lol. And, yeah, her character design is the best here.