Octquadamiss
A person who thinks they're the main character of a movie but it's just a bad script.
My brother is an octquadamiss. He thinks he's a wizard but can't even do basic math.
My friend is an octquadamiss. She tried to start a band but it was just her singing in the shower.
My uncle is an octquadamiss. He tried to run a restaurant and now it's just a pizza box factory.