imaginary creature(n = noun.person) imaginary being - a creature of the imagination; a person that exists only in legends or myths or fiction;
is a kind of imagination, imaginativeness, vision
has particulars: hypothetical creature, mythical being, giant, hobbit, mermaid, merman, cadmus, monster, witch, character, fictional character, fictitious character, psychopomp, sylph, unicorn, death, gargantua, maxwell's demon, martian, humpty dumpty, jack frost, mammon, father christmas, kriss kringle, saint nicholas, saint nick, santa, santa claus, st. nick, tom thumb

creature, creature comfort, creature comforts, hypothetical creature, imaginary, imaginary being, imaginary invalid, imaginary number, imaginary part, imaginary part of a complex number, imaginary place, legendary creature, marine creature, mythical creature, pure imaginary number, sea creature