i promised myself to only answer this ask after finishing the draft of TDI pt2, so i'm sorry for the delay (and also thank you for helping me create a fake deadline!)

it all kind of worked out intuitively, to be honest. when you think about original Adachi, you see lots of common 'male anti-success' struggles there: undervalued at work (success = power), underpaid (success = money), lonely (success = sex). so it made sense to recreate the struggles for fem!Adachi but with typical female values. and even though some men would argue that sexual harassment equals attention and ~popularity~, it's definitely on the opposite side of the positive values for most women. so that's where fem!Adachi's backstory and attitude to men came from.

making her gay was a prerequisite because i wanted the ship to stay same-sex. but simply making fem!Adachi a SA victim and lesbian didn't really convey the original problematic nature of the character. what could do the trick, in my opinion, was making her a sort of a radfem, who almost indiscriminately hates men and hates women who don't hate men. i had a radfem twitter-acquaintance in the past and it did seem to me that this movement sadly spends more time aggressively attacking fellow women than helping them overcome whatever struggles or offer protection/education.

there's also a layer of my own sentiment in there. i come from a place where you won't see a bisexual-identifying woman dating a girl, because same-sex relationships are illegal and heavily criticized by literally everyone. by identifying as 'bisexuals', local girls mostly imply that they 'kissed a girl once while drunk' (and that's somehow sensational..), 'wouldn't mind to play around~' or 'would agree to a threesome'. they don't even allow themselves to think about girls seriously because it's too dangerous and they have the room for safety (=they're still attracted to men). because of this local sociocultural situation, i - as an ace homoromantic ciswoman - would have lots of trust issues dating a bi-woman, bc it'd make me worried if she takes it seriously and sees as long-term.
while i'm not sure how things are in this regard in Japan, i do hope they're doing better than this. but for the sake of a fictional story, i thought that similar-yet-aggravated trust issues in Adachi can be sort of in-character given the original Adachi being very critical of Yamano's affair and "betraying his opinion of her".

if there's anything specific in Adachi's lines that you're curious about and i didn't explain - feel free to ask! and thanks for wondering about my thought process for this in general :>