Rainbow is a “Sentinel of Light” - a guardian of light and color endowed with magical powers to protect Rainbow Land and bring color to all the corners of the univers. A girl of indeterminable age, perhaps 8 or 9 years old. Old enough to ride a horse on rainbows, but young enough to think that’s THE COOLEST THING EVER!

From rainbowbrite.com

You are Rainbow Brite! You have an outgoing personality and sometimes overly enthusiastic. You trust your instincts, and you're not afraid to express your feelings. You always look out for your friends. You are generous and curious, but your naïveté can often get you into trouble. Your dogged optimism softens the hearts of even the toughest critics.

From Feeln's "Which Rainbow Brite Character Are You?" Quiz