oh i have sooooo many, i actually talked a bit about my enby/genderfluid headcanons in this ask, but i do have sexuality hcs for almost all charas in enstars too. so to not make it too long, i'm gonna list them in categories (just a reminder again that these are MY headcanons and reflect my own thoughts and feelings about these characters, nothing more):

pansexual: ritsu, rei, rinne, hiiro, tatsumi, kanata, leo, eichi, yume

bisexual: wataru, hokuto, mao (in denial), chiaki (in denial), hiyori, niki, hajime, kuro, arashi, jin

gay: aira, tori, jun, kaoru (in denial), koga, mika, tomoya, nazuna, keito, izumi, natsume, akiomi

asexual: yuzuru, subaru, mayoi, ibara, shu, himeru, kohaku, sora

aroace: nagisa, yuuta, tsumugi, kanna

lesbian: anzu <3

straight: makoto, tetora, hinata, adonis, mitsuru, souma, tsukasa, madara

non-binary: ritsu, yume, shu, natsume

genderfluid: wat...