Your gateway to endless inspiration
Ok, so you know my Batman in omegaverse post (I'll link it just in case you wanna read it), where I talked about how Batman is an Alpha and Bruce Wayne is an omega, and then I reposted it with a continuation of my omegaverse headcanons of some of the batfam. Well I've been thinking for a while (especially because I've been reading a lot of omega!Bruce SuperBat fics), and I realized something, or well, I already knew but still... O/B/A thing is a species thing, so technically it should be a human thing, not a universe thing, differently from soulmates au (maybe I'll do a post about it one day) and in a lot of fics some of the aliens that live on Earth have a secondary gender of the omegaverse, but they technically talking they shouldn't so, here's my theory/headcanon.
Let's start with the character that started all of this
Clark Kent aka Superman, and just Kryptonians in general: Kryptonians seems to be the most human like between all the other aliens in DC, or at least this outside of the Yellow sun that basically gives them more power by some kind of photosyntesis, but outside of this they are basically the same as a human apparently, so they maybe developed a similiar A/B/O thing, but if we not consider this then they shouldn't have a secondary gender, super senses yes, like (under the yellow sun) they can smell the pheromones maybe distinguish them but probably don't really get affected by them, this depends then on how the pheromones works in the omegaverse au If we consider the first case in MY OPINION (so my headcanon) is that Superman is an alpha, a powerful alpha, but Clark Kent, is still an alpha, but more like a "weak alpha" in the sense that he tends to be more a beta than an alpha diffently from Superman.
Now to the martians: THEY DON'T HAVE A SECONDARY GENDER, that's it, they change shapes, they can mutate their forms, imitate other beings. I'm not even use they actually have a proper sex and/or gender, but to my knowlege they have, anyway if we consider the martians on Earth, when they are in their secret ID they imitate betas, this is the thing that would make more sense.
Now Koriand'r and Tamarian in general: they probably don't have secondary genders, to my understandings they are basically warriors so compared to humans A/B/O they are the most similiar to alphas but without the biology of one, so the ones on Earth, so Koriand'r, in their secret ID they pretend to be alphas.
That's it, if you want me to do an analysis on Amazons and Atlanteas, because technically talking they aren't exactly humans... just tell me and I will.