I'm never forgiving Otoha and her only redeemable feature for me is her ass. That's what we call everlasting bias, I'm dying on this hill.
I particularly dislike that Selebus has her sexually assault Niki right as she's getting into her relationship with Akira again (and although it isn't straight up "cheating" since Niki was clearly assaulted, it was not pleasant to watch the first time, nor her entire arc refusing to listen to Niki saying no - even Akira is more respectful to Yumi after he assaults her), then years later she steals the violin scene with Maya from Akira as well, and is disgustingly flirty about it.
First Niki, then Maya. Next we'll find out that her deal with Sekai poetry is that she was her first crush or something. It's like Selebus keeps pushing her onto Akira's real girlfriends/actual partners.
My problem with Otoha was never mainly related to Rin, that was just the final verdict.