Board Thread:Theories/@comment-27683524-20160127003803/@comment-27441457-20160127181126

Unless we've been given specific preferences, some of these are really hard to pin down. It's canon that Ymir and Historia are a couple, but that doesn't necessarily mean either is 100% homosexual. Either of them could be bisexual, homosexual, pansexual (gender doesn't factor into attraction), or even demisexual (attraction only exists after a platonic bond has formed). We can only say for certain that neither are heterosexual.

Also, Levi's sexuality by Isayama's quote is simply that he likes "tall people", which could be interpreted as either bisexual or pansexual. This goes along well with the possibility of Hange being gender-neutral (at least for the LeviHan shippers who hold this headcanon).

Another thing we can say for certain is that Reiner is attracted to women, or at least Krista, as both his "soldier" and "warrior" identities have shown. This still doesn't say much though, as all this cancels out is homosexuality as his sexual preference.

And all this isn't even scratching the surface when it comes to the potential differences between the characters' romantic attractions and sexual preferences, which now and then don't always match up. It's a complex topic o_o.