Prince Rainbow was a messenger for Lord Frith. He had a rivalry towards El-ahrairah and Rabscuttle. At one point, he sent in a double agent to spy on El-ahrairah. Prince Rainbow purposely started planting a garden of Carrots, and if he caught anyone trying to steal these carrots, he'd kill them.
El-ahrairah plotted to make this double agent seem mentally ill, when he stole the carrots. And so he did by making a hedgehog sing to the moon, and a pheasant swim in a river. He had also made Rabscuttle dress up as an odd rabbit with green ears and a red tail and act as a messenger from Lord Frith himself. The following morning he had reported to Prince Rainbow that El-ahrairah had stolen Carrots from the Princes garden. El Ahrairah was sent to court in order of the prince, only the jury were all Elil. El-ahrairah asked Prince Rainbow's spy to explain the story, and so he did. The Jury came up with the conclusion that he was delusional and sent El-ahrairah free. Yet Prince Rainbow knew that this was the rabbit's Mischief.