Symbiotics

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Symbiotics are living beings (such as headmates) that share an intrinsical connection with a sentient headspace.

Their connection is called Symbiosis.

Related Terms
"Resonants" is the headmate counterpart of "Symbiotics"; this type of connection is called Resonance.

Synpath is a term that refers to having a similar deep connection/bond with something, such as strongly relating to it, acting like it/understanding it, but not quite being it; typically a fictional character.

History & Etymology
This term was coined on November 25th, 2023, by Pluralpedia user Oceanic-Lanterns. It was created as a sentient headspace counterpart for the Resonants term.

The term Symbiotic(s) has been chosen because it refers to "a relationship of mutual benefit, especially among different species" or "a close, prolonged association between two or more organisms of different species, regardless of benefit to the members", which seemed to describe very well the experience.