Rainicorns

Rainicorns are a species of unicorn/rainbow hybrids that live in peace in the Land of Ooo.

Background
Little is known about the background of the Rainicorns, other than there was a war between the Dogs and the Rainicorns. The only known Rainicorns in Ooo are Bob, Ethel, and of course, Lady Rainicorn. Although the only known rainicorns speak Korean, not all do.

Appearance
Rainicorns are creatures with colorful bodies. It is unknown if male rainicorns are shorter than female rainicorns or if length varies due to the fact that out of the only three that have been seen only one was male.

Abilities
All rainicorns possess the ability to fly by intercepting beams of reflected sunlight & "dancing around on them", the ability to change the color of any object by shooting it with a chromatic beam fired from their horns, and the power to stretch their bodies out to various lengths, much like Jake.

Notable Rainicorns
Trivia
 * Lady Rainicorn
 * Bob Rainicorn
 * Ethel Rainicorn
 * For thousands of years the Rainicorns battled the dogs over territory in the Crystal Dimension. The outcome of the war is never outright stated, but it can be inferred that the Rainicorns have some stake in the dimension today, as Lady Rainicorn's parents come from there in Her Parents.
 * Rainicorns may or may not eat humans as in the episode "Her Parents" Ethel and Bob Rainicorn try to eat Finn. They then enjoy a picnic of "soy human" which is supposed to taste just like the real thing.
 * It is possible that females tend to be longer than males, based on Bob's height in relation to his wife's and daughter's. However, it is quite posssible that Bob is just an exceptionally short Rainicorn, regardless of gender. It should be noted that Bob and Ethel did not seem surprised that Jake, while thinking that he was a real rainicorn, was just as long as Lady.
 * There is an alternate version, the Cat-Monochromicorn Wars.