Kylar is a creep not sweet. She is the typical obsessive yandere type but what makes her worse is she is also an outcast and a stalker. As for Sydney she kinda loses the sweet side of her when you corrupt and you even said you choose corrupted Sydney anyway.
Idunno why you say " there are enough Soft and sweet characters " as if there must be a ballance between dicks and sweets. Besides as i said we don't know the reason for the way she is, you saying she is a bitch cause that who she is, is liek, yur oppinion maan. But seriously, i don't know what your problem is with more content. Sounds like you just don't want to feel guilty for hating her if the dev gives her a tragic backstory like her dad raping her or sumthin.
And again, you're just saying your opinion with Whitney being better as male. I wholeheartedly disagree, to me Whitney comes off as the typical bitch bully wandering the school with her cronies like Victoria from Life is Strange. But if you like her as a dude then it's fine. I don't care, just like you shouldn't care what other people choose for Whitney's Gender.
Toodles