Paraself

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A paraself is version of the dreamer in the daydreams of someone with Maladaptive Daydreaming Disorder.

Related Terms
A paraself that becomes self-aware/sentient can be called a previself, and can be said to have a parative origin.

History
The term was listed on languidschizoid's tumblr blog as early as 2017, and noted as being in circulation already rather than being coined by them.