Kotone's story was sad and all, but it doesn't excuse her from pushing her own ideas and insecurities on Mogu, because she was hurt and assuming Mogu is "weird" like her, so Mogu will never find anyone as well, so only option for them is to settle for each other, since they're better off like that. All under the disguise of pretending to know better what is best for Mogu, while completely ignoring Mogu's identity and their own desires. She couldn't even not see Mogu as "just another guy" and reacted with disgust, while at the same time forcing them to "be a girl" so she can feel safe and secure with them. All she did for Mogu was self-serving and focused only on making her life better. Surly the best relationship for Mogu.
This.
But the author seems to love happy ending, so I expect admission of guilt and redemption story, and possibly new love story for Kotone.
Hopefully the love story will be Mei (I don't want a new character, and it would be sweet if she fell for a trans girl)
While that would be sweet, and a brilliantly important statement of the thesis of this manga (that people are what they are, that a person's sex doesn't define how they should present themselves and their identity and that people just need to understand and love this because it's just as human as shivering in the cold)... There's a lot of work needed to be done on that front before it'll be an acceptable thing.
This is coming from someone who is in almost exactly Mogumo's position. NB with a cis SO who has been trying their best to understand me. I know I had some deep worries regarding my best friend when she was on a similar track as Kotone is right now with Mogumo. Granted we were adults and so had a frank fight followed by tear-filled confessions of misplaced and trauma inspired homophobia and the subsequent queer dismissal that usually follows that.
What I'm saying. Seeing Kotone fall for Mei would be a delight. But just being in a cute Yuri relationship with a trans girl won't immediately solve all her problems. More unpacking needs to be done and probably some adult intervention...
For me, her falling for Mei would require her to get over her problems (such as understanding her sexuality and coming to terms with it). Her character development could finish with her getting over Mogumo, and falling for someone else. In this case Mei would make a great candidate, since she's:
1. the only other girl in the story, and introducing another girl just to be a love interest would be stupid.
2. a trans girl, so Kotone falling for her would really show how she doesn't view Mogumo as a guy anymore.
But just because I would like her to get one doesn't really mean that it's necessary for a good character arc. The important thing though, is that the relationship comes after the character arc.
