A piece of work
A person who's totally nuts and acts weird, but they're also kind of cute in a crazy way. They're like a weirdo with a heart of gold.
My weird friend is a piece of work. He wears socks on his hands and talks to his plants.
My neighbor is a piece of work. She wears a hat made of spaghetti and dances in the middle of the street.
My teacher is a piece of work. He thinks he's a wizard and uses a pencil as a magic wand.