Board Thread:Speculation House/@comment-4047010-20160206215454/@comment-4010415-20160210000124

Raven might be a bird Faunus who has feathers in her hair. That's why some people theorize that Yang could be a half Faunus.

At this point, since there is literally nothing in the show that could suggest that half-Grimm people exist, and nothing about the Grimm tells us that such a thing could be possible, this hardly even counts as a theory. It's more like fanon. It fits better as a fanfiction idea than an "I think this is happening in the show" theory.

The fact that, whenever something is removed from a Grimm, that thing instantly starts dissolving and disintegrating suggests that you cannot just take a sample from a Grimm and implant or inject it into a person.

Grimm aren't vampires or werewolves, so a Grimm attacking someone is highly unlikely to spontaneously cause that person to become part Grimm.

I'm sorry if it feels like we're attacking you for your theory. A lot of people here on the wiki generally prefer theories that actually have a likelihood of being canon, supported by evidence from the show and the writers. If there are things in the show that are or can be evidence that the theory is not true, then most people aren't likely to support it just because it's a neat idea.