Let's say that for whatever reason and whatever way you form a headmate you have a set of aspects that you're capable of giving them.
Now let's further say a personality and perspective is all you are minus the body/mind.
And Let's define that the expression of that personality is divided into personas where a persona is a set of situational aspects, and each aspect can contain a set of facets. Each persona generally follows one or more archetypes that generally govern the behavior.
So you could say you build a headmate from a known archetype and be pretty convincing given automy. Or perhaps you just cobble together facets as you go, but generally there are predefined archetypes you could identify for each persona regardless of formation and you could say if that persona deviates too much then that would be considered "out of character".
Now, a singlet strictly follows the rules of one persona per situation. One perspective that's locked in by ego, so a static personality that does not utilize all possible aspects you are capable of.
I trust you guys' opinions more than the generally mentally ill rest of the community, so here's the question:
Would you say your headmate has taken certain aspects that you yourself find fun or interesting but can't express yourself? Even further, could they take some "out of character" aspects, that you may use occasionally, over completely?