Board Thread:General Discussion/@comment-35348373-20190516061314/@comment-27745396-20190517114702

Technically, since human and faunus can have fertile offsprings (as far as we know, we are yet to see human-faunus family or any "half faunus" characters), they are at least in biological sense part of same species. Still, thanks to their clear differences in appearance, humans and faunus are probably some sort sub-species (like sumatran and siberian tigers). So in biological sense, you could say that faunus are humans.

If we use this same logic with SEWs, we know that they can have fertile children with "normal humans" and look pretty much identical with them. From this we can assume that SEW are same species as humans. And since there really isn't any other traits that could separate SEWs from humans, I think it is just (probably dominant) mutation.

Or maybe it's all about magic or fantasy logic and biology has nothing to do with it...

Personaly I never liked the GoL explanation. The Brothers left Remnant and supposedly had no contact with "humanity 2.0" so how on earth GoL was able to create SEWs? The only logical explanation I can think of is that there is a some sort secret SEW village guarding GoL's three/bond thing and they got their powers from drinking the bond's water... Which made Salem immortal so there is that problem... Maybe SEW are children born from the union between the immortal guardians of the bond and normal mortal people? Or maybe Maria na dRuby were wrong and SEs have something to do with Ozma since we did see him to have two silver eyed kids during one of his lives.....