Please stop calling fictives “alterhuman” and lumping them in with otherkin. fictive is a DID/OSDD made term and is such a broad spectrum it doesn’t belong with otherkin or IDs at all. You’re making it harder for us to be taken seriously.
Fictive is a soulbonder/endogenic term that was graciously shared with the DID/OSDD community, please stop trying to appropriate it.
edit:
sources
Here are two of the best sources I can get off the top of my head. Two are DID/OSDD blogs, the other is a more general plurality blogger.
http://if-we-were-to-tell-the-truth.tumblr.com/post/135464828800/whats-a-fictive-alter
http://solipsistful.tumblr.com/post/114068224610
The DID/OSDD specific term for the equivalent of a fictive is a ‘fictional introject’.