"imaginary person" is a correct and usable phrase in written English.
You could use it when you are referring to a person, or character, that doesn't actually exist or is made up. For example: "The author created a fascinating imaginary person that weaved their way through the story."
The soldier peered forward, and suddenly seemed to be addressing an imaginary person.
Finally, someone will understand you the way only an imaginary person can.
She is an imaginary person in another sense too in that Eileen has imagined her.
They can include texts, including live replies to messages written by humans, and sending photos of the imaginary person.
Rock music appeals to teenagers trying to make sense of life, constructing their identities using an imaginary person.
Brancusi's contribution to the Salon of 1920, Princess X, a portrait of an imaginary person that takes on a curiously phallic form, created a scandal.
The surnames presumably entitle the playwright to her disclaimer that the play is "dramatic fiction, imaginary persons, events and relationships".
Most interesting of these are the bhāṇas, which may be monologues in which an actor addresses imaginary persons and is answered by them, as he paints a picture of town life full of personal and social satire.
And everybody, it seems, is shadowed by an imaginary other person, a lucky counterpart, who gets all the happiness going; Lacan writes of "the jealousy born in a subject in his relation to an other, insofar as this other is held to enjoy a certain form of jouissance or superabundant vitality".
Participants were presented with a picture (in A1 size poster format) of an imaginary young person affected by an unidentified health condition.
Furthermore, persons suffering from schizophrenia may easily attribute self-generated actions to (real or imaginary) other persons (see [23]).
