Lord Monochromicorn

Lord Monochromicorn is the gender-swapped version of Lady Rainicorn created by the original series designer Natasha Allegri and featured in "Fionna and Cake." He is the loyal companion of Prince Gumball and the boyfriend of Cake. He communicates by using his hoof like a telegraph to communicate with Morse Code, rather than by speaking Korean, as Lady Rainicorn does. (He stomps his hoof for a dot and scratches the floor like a line for a dash.)

Appearance
He is completely black with a long, gray mane, entirely different from Lady Rainicorn's multicolor scheme. He is more horse-like compared to Lady Rainicorn.

Abilities
According to Natasha Allegri, he can open up black holes. He can also stretch and fly like Lady Rainicorn.

Trivia

 * Lord Monochromicorn can neigh.
 * During his first appearance in the actual show when Cake greets him with "Hiya gorgeous!" he replies "Hey!" in Morse Code. Near the very end of the episode when Fionna and Cake are talking about how much they love the Ice King, Lord Monochromicorn shows up and uses Morse Code to say "We Love You Ice King!"
 * When Lord Monochromicorn made his first appearance on screen, the sound of thunder could be heard in the background.
 * In the original storyboard, Lord Monochromicorn's horn is shaped like a lightning rod and his eyes are like Lady Rainicorn's.
 * Prince Gumball sometimes calls Lord Monochromicorn "Mo-Chro."
 * Lady Rainicorn has said that she flies by using light and "dancing" on it. However, Lord Monochromicorn is black, which would mean he would absorb light.
 * Lord Monochromicorn resembles a horse and a moonbow (a rainbow seen at night).