Alone
Some people are alone in their heads...it's just them, the roles they take day-to-day, the masks they put on when the boss checks up on them, etc.
But just them. We call them "singletons" or "singlets" to differentiate them from "multiples"
Some people take the roles and masks a little farther than others, but they're still only one person underneath it all. Sometimes it's like there's more than one facet or aspect to a person.
Note that this is in direct conflict to self-pluralism's views of the normal mind.
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