portrayal vs persona

portrayal and persona both are nouns.

Word	Noun	Adjective	Verb	Adverb
portrayal	Yes	No	No	No
persona	Yes	No	No	No

As nouns, persona is a hyponym of portrayal; that is, persona is a word with a more specific, narrower meaning than portrayal:

portrayal: acting the part of a character on stage; dramatically representing the character by speech and action and gesture
persona: an actor's portrayal of someone in a play

Other hyponyms of portrayal include impression, character, part, role, theatrical role.

portrayal (noun)	persona (noun)
representation by drawing or painting etc	(Jungian psychology) a personal facade that one presents to the world
acting the part of a character on stage; dramatically representing the character by speech and action and gesture	an actor's portrayal of someone in a play
any likeness of a person, in any medium
a representation by picture or portraiture
a word picture of a person's appearance and character