another random post because apparently I can't go to sleep if I don't make delusional theories on the internet
anyways
Dark has pretty much shown us that in it, love transcends universes. That's kinda the focal point of the series, I guess? Anyways². We can see this specifically with Peter and Bernadette as well, and they are the pair I'll be focusing on for the purposes of this post.
We see them end up together at some point/have some sort of relationship in all the three universes, with a shift in Bernadette's gender presentation.
Eva's world: "Benjamin" is completely closeted and presents as male. I think we only see him like once and that time he's in the church talking to Peter. Then Charlotte arrives and they stop talking and it's all very awkward. It's not stated if they had anything going on there but just. Watch the scene and tell me it isn't terribly awkward.
Adam's world: Bernadette is out of the closet as a trans woman, but hasn't yet reached the transition goals she hoped for. She's with Peter, sort of.
Origin world: we see Bernadette as a more well-adjusted person, and just in general recognized and accepted by the people around her for who she is. And she ends up with Peter.
Peter kinda loves her in every universe, in the end. Even if we don't get the full picture a lot of the time, they're still secondary characters. But I don't think he just ends up with her because she's trans and he's gay and in denial. That would make sense if you only looked at Adam's or Eva's world, but that isn't what we're doing here. Basically, I think love in Dark doesn't just transcend universes, but gender as well.
all this to say if Sonja and Martha met they'd be lesbians and if Jonas and Marek met they'd be gay. And it's not about orientation. Just. Doomed by the narrative but they'd still love each other in any form I think