WHAT IS THE CORRECT TERM FOR SOMEONE WHO HAS MIXED PERSONALITY.?

dissociative personality disorder….im pretty sure…many people often confuse this and schizophrenia, when they are two very different disorders

There is no term for that. Everyone has their own preferences and interests and it is rare to find a person whose interests completely and exclusively fall into only one "category"

Dissociative Identity Disorder/Multiple Personality Disorder (as the others have suggested) is when a person has two or more completely different personalities (which includes mannerisms, voices, temperments, even memories) who are usually unaware of one another, it is very rare and very serious and certainly not what you are talking about here.