Rainbow Bird is a bird that is Boomerang Bird's friend.
AppearanceEditHe looks like a rainbow Boomerang Bird with scarlet for the head and stomach. His corpse looks like simply himself with his tongue out, eyes looking at the top left, and sad-like eyes.
He propells upward as an ability, wrecking the top location, allowing the Red Bird to break through easily.
In the only picture, from left to right, in the middle is the sprite he uses when he is using his ability.