Let's start off with popularity, so here goes nothing!
Katsuki Bamkugo
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He hasn't shown any real attention towards anyone, male or female. He mostly just keeps to himself. He's blushed once or twice, but he is focused on himself, which I respect and agree with. I think his most likely partner would be Deku if he was romantically interested in men and if Deku was also romantically interested in men. I feel like he's demiromantic and straight, but also open to trying things out with men.
In general, however, he wouldn't have lot of romantic or sexual relationships because he's not attracted to other people.
I don't know about the straight thing, but he's defo a demiboy, maybe not straight.
He probably knew somewhat about the LGBTQ community. He'd either not care, or give homophobe vibes because yk, he has a dirty little secret.
Izuku Midoriya
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I'd let him hit wearing this-
Anyhow, I think he's definitely straight or at least bisexual. We only ever see him having romantic feelings for Ochaco and vice versa, although he does blush a lot when talking to Kacchan. That's probably just nervousness because of the whole 10 years of bullying, but who knows?
I would love it if he was bi lol, but it isn't really a priority in the manga or anime right now. I don't think he's gay at all because he's shown to have feelings for Ocha. But he might be bisexual, and I hope he is.
Him being bisexual would make sense. Because he's super protective and loving to Bakugo, to the point where it's sort of gay-
He definitely doesn't know what the LGBTQ community is, and when he finds out he's super flustered because he's like, "That sounds familiar!" But he defo supports even if he's straight.
Shoto Todoroki
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Eh, hard to tell. I don't think I've ever seen this dude blush. He has shown zero attraction to anyone. Signs of a very good relationship which is open to interpet, but nothing that would scream major gay, bi, straight, or anything like that.
And honestly, I'm a little bit glad he hasn't shown attraction. He's just working on himself, his trauma and his family. Which are noble and sensible things to work for. Let's save all that lovey dovey crap for when they're not.. well, in a more stable situation.
I feel like he would not know that LGBTQ people existed but just would be super chill about it. Like, "Oh cool, sounds nice" and then immediately go back to doing whatever he was doing. He's not a super supporter but not against it at all, and generally doesn't care much about anything if it's not effecting him/not harming people.
He's good with the ladies though, I'll tell you that!
Eijiro Kirishima
He's giving me straight but supportive and curious vibes. He probably smells and tastes like red Kool aid. I feel like he'd be the type to kiss a dude and then be like, "no homo!" We don't get any indicators of his sexuality and there's not a lot of blushing on his part because he's confident and sure of himself.
Denki Kami
I think he's straight. No, like seriously. He's as straight as the equator... and the equator is curvy😉
All jokes aside, he's either straight or bi with a preference for females, because of his thing for Jirou.
