madcap
A girl who acts like she's on a rollercoaster and doesn't know where she's going. She's fun but also a little nuts.
My friend is a madcap. She wears a hat made of glitter and dances in the hallway.
My sister is a madcap. She eats ice cream for breakfast and wears pajamas to school.
My mom is a madcap. She sings in the shower and dances to old songs.