I’ve been having some chats with my dear friend about omegaverse and like who would be alphas, omegas, or betas in various fandoms we like. So here I present to you my personal supernatural omegaverse assignings! (Again these are my personal thoughts)
Dean is an alpha BUT he’s such a maternal alpha, like he very strongly is the leader, caregiver, protector type/side of an alpha. He’s mistaken as an omega when people see this maternal side to him, but then the moment something happens to Cas or Sam……well. Like I feel he did some soul searching (some how) while Sam was at Stanford and came somewhat more to terms with how he has a fluid relationship with how his alpha identity presents and works for him (and like this can definitely be seen in the later seasons).
Now Sam is an omega but, BUT! like dean he’s assumed to be a different presentation. When younger (like right after presenting) bc of their father and like dean’s own complicated relationship with his presentation, Sam is just assumed to be a beta because he just doesn’t seem “soft” enough to be an omega but he’s also not “tough” enough to be an alpha. Like he only really comes to being seen and like understanding his omega side when Dean shows back up. Like idk it’s that security of having dean back with him even if life was so great when at Stanford that finally lets him become more comfortable showing his omega side. Especially in the earlier seasons Sam does try and take care of dean in his own ways.
Like the only times Sam and Dean are actually seen as their true presentations is when they’re together. Like oh yeah whoops Dean is an alpha, you shouldn’t have tried that with Sam. And oh yup Sam is an omega that boy is sad and pathetic but really only the most when with Dean.
Now Cas is kinda special. I see him as having been an alpha but then he became beta. Let me explain, I see angels as having no actual “presentation” but they often come off as alpha bc that’s the closest thing humans can comprehend them as. But with how long Cas spent with Sam and Dean and how he interacts with humanity in the later in the series he slowly becomes beta. He’s very much a more dominate beta, like he still has those alpha aspects but not enough for people to mistake him as such. He’s very much a beta.