Halftroject

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A halftroject is a half introject, they can be introjected off the character's design or a brainmade headmate who has memories of being in a source but was never actually in said source, like a self insert or OC.

OC introjects would also fit here but it really depends on what the headmate in question is more comfortable with. This term can also be used for introjects who don't really identify with their source any more and are not comfortable with the terms fictive or introject.

In minimal words, a halftroject is half introject half something else, whether it be brainmade or not feeling like your source anymore.

Related Terms
Molded, semi-introject, and post- may describe similar experiences.

History
This term was coined by fightinggod03 on Tumblr