Fictish

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A fictish is a headmate who originated as an entirely unsourced entity and later adopted traits of a fictional source. This can be done for any reason. These headmates differ from fictives in that they are not introjects. If a fictive is an introject of a fictional character, a fictish is something similar without actually being fully sourced from a piece of media. These headmates may or may not consider themselves sourced.

Etymology
This term derives from the term fictive. They are “fictiveish” in that they do draw from fictional sources, but are distinct from fictives due to this not being their entire identity or origin. Hence they are “fictish” but not “fictive.”

History
This term was coined by the Ironwood Collective on Tumblr.