Hmm I think I'm gonna be a little boring here.. I usually think of her in some sort of relation to Toichiro, because the only context on her that's available is that she wanted him to be a gentle and loving father to Shou, she didn't like that Shou had powers (that he was going to be like Toichiro not only in terms of character and going down the bad route but also him having dangerous powers he could potentially use to harm others). According to Toichiro, she has a big heart (also seen in the scene when she takes in a dirty stray kitten) which kind of makes me think she could see the good even in someone like him. I used to wonder why she even married Toichiro but I know some people can change both for good and worse at some point in their life. I think she might have liked to uncover the vulnerable and sweet spots of his personality from behind the cold facade he wears. I think she's the kind of person ready to give someone another chance... up to a point that is because she can see when a situation is finally hopeless. But she even was going to visit Toichiro in prison after his fall, meaning she does feel some sort of affection for him. I like to think they could start over again and try to make peace with their troubled past, not without effort from both of them.

I sometimes see people pointing out that it wasn't very responsible of her leaving Shou with Toichiro when they parted but I honestly think she might not have had enough power to stan up against her husband who would of course want Shou to stay with him and become his inheritor. Also frightened by esper powers (that she surely has witnessed used against people) and scared she wouldn't be able to take care of Shous abilities by herself make me feel a kind of sympathy towards her.

sorry you asked about cute headcanons and I started just blurting out everything else about her dskjkfh I do think she adopts a cat after she leaves.