A fuzztive is someone who is partially, somewhat, or almost a fictive, but fictive doesn't seem ‘quite right’ or ‘entirely accurate’.
The term is when someone is between or partially fictive and something else (the something else may or may not be defined, personal choice).
Fogtive is the factive counterpart of a fuzztive.
Altive refers to meaningfully (whatever "meaningfully" means for the headmate in question) "AU"/alternate universe introjects/introtives.
Post-Fictive is a word for a headmate that previously held a fictive identity but no longer considers themselves to be that same person.
Fictive-flux is a term for a headmate that only sometimes identifies as a fictive. Blurrflux is a word for a fuzztive or fogtive that switches between identities.
Quoisourced refers to a headmate that is unsure if they have a source or feels that the binary of sourced and sourceless doesn't fit them.
Factional can refer to a headmate who is a fictional character in this universe, identifies as a fictional character but doesn't consider themselves fictional, identifies as a fictional character but doesn't connect much to their source self, or a member who is in some other way spiritually connected to a character.
Fictionkin are otherkin who either identify as species from fictional media or as characters from fictional media.