Core

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The core is a headmate with a direct connection to the body's pre-plural self. Not every system has one, and not every system had a point at which they were not plural.

The core often inherits the personality, identity, and/or memories of the pre-plural self.

Related Terms
The host is the headmate who is most active or most responsible for day-to-day activities, which can be distinct from the core. Some systems also have an original, or a headmate that existed before becoming plural; these are more common in thoughtform systems.