Daisy uses her beauty to cover her true self. “he found what a grotesque thing a rose is and how raw the sunlight was upon the scarcely created grass.” This quote is a metaphor in which daisy is the rose, and she covers her cruel true self with beauty and innocence.
Gatsby builds his own caricature through fabricated stories and spreading rumors about himself. Gatsby is in my opinion the character that most uses illusion. After all Gatsby is prepared to throw huge parties in hope of daisy once coming in as well as building a false identity. Gatsby’s illusion is so strong that in the mind of the reader and the rich of both east and west egg see him as mythical almost more than human because no one truly “knows” him. He loses some of this when he introduces himself to Nick when you realize Gatsby is a man like any other.
I believe nick stays rather true to himself throughout the whole book and therefore did not have to use illusion. Nick has nothing to hide and only tries to understand this new world he finds himself in.