Rainbow is Eini's pet dragon. She has purple and lavender skin, blue eyes, and a multicolored horns.

Energetic and playful, her favorite past-time (when not grooming herself) is to play fight with her fellow dragons. Nearly as fearless as her rider, she is less circumspect than she should be, as seen trying to pull back Heatwave by his tail while he's trying to attack Feather. Rainbow is also very caring and nuturing towards others. She is a happy and playful dragon who loves playing tricks on her friends and doesn't mind a little prank to herself from others.

Rainbow can breathe rainbow-colored fire.

Trivia:

Rainbow is named fter her multicolored horns.