Coming up with a consistent definition for Otherkin is near impossible, even when collaborating with only Otherkin. I recently had an argument in the Otherkin Wikipedia article (a mature one), as they want to merge it with Therianthropy. Therianthropy is the belief that they are, specifically, in one way or another, animals (correct me if I'm wrong, Therans). Not all Otherkin believe so. For example, I have, for all but a select few of my lives, been pretty much everything but any animal-related 'kin. Therefore, I found the definition unjustified. Many will agree. I brought this up because a number of Otherkin supported that merging. Of course, those Otherkin were Dragons, wolves, and the like. Truth be told, Otherkin can be just as ignorant as humans. It's not fair to single out humans, which would be just as those Otherkin who choose to do so (not pointing anyone out - simply making the point for those who read this).
From a scientific standpoint, however, Otherkin are met with more problems than any religious group on the planet. A quote from the Wikipedia article:
Otherkin Wikipedia Article wrote:
According to diagnosis criteria put forth by mental health professionals, the belief that one is an animal or can be turned into an animal is termed clinical lycanthropy5
, a delusion of varying severity and significance.
This is, of course, because those "mental health professionals" take part in their religions, so their diagnostic of themselves would be severely bias.
So it'll be quite a while before everyone can agree on what Otherkin really is, an whether or not they truly exist. One of my goals is to find some way to change that - but looking at how things are going, that will not be any time soon.
By the way, the most commonly used definition of otherkin: Otherkin are races of beings that do not have a native origin on earth. They are often discussed in myths and legends, and are not regarded to be real by the modern scientific and historic community. These include the popular types of kin (slang for Otherkin), such as Dragons, Vampires, Elves, Fairies, etc.
Anne realised she was otherkin because she had painful memories of her family being killed in another life, as another being not on Earth.