i'll do it down in like group order from the wiki
fine - Eichi & Tori. but i'm not against making wataru a woman simply for eiwata yuri (bc they have SOMETHING going on between them in the anime. like.. they are homosexuals.)
trickstar - hokuto & makoto, but they're also a unit that works perfectly fine being all women.
RYUSEITAI - shinobu & kanata, they're kinda 'meh' to me for the whole unit to be women but i'm not against it.
ALKALOID - theyre a little harder bc the only one i see that can work as a woman is like aira and MAYBE tatsumi but they're like.. meh. ykwim?
eden - probably just hiyori and maybe nagisa
Valkyrie - Mika. Shu works too, but i really love fem mika.. like a lot a lot.
2wink - both of them HAVE to be girls or else it just doesn't work, but i can't really see them as women unless EVERYONE else are women.
crazy:B - RINNE! and kohaku, but they're a unit that works as all of them working as women or just rinne being a woman.
UNDEAD - just kaoru. i can see just fem!UNDEAD and i fw it, but undead is literally just a lesbian and her 3 annoying guy friends.
Ra*bits - tricky unit bc they're a unit that can work as all girls or as all guys
AKATSUKI - just keito. i like fem keito.
knights - tsukasa i think her and naru do each others hairs :3
switch - they're a unit that works as all girls or as all dudes. it's very switch swappy with me. i do enjoy the fem!tsumugi arts tho
and Madara. i love fem madara it just makes sense!
i'm not touching Special for Princess! bc they're all children. not that they can't, it's just lowkey feel inaccurate bc of how they're styled in the art style. 🧍‍♀️