Lady Rainicorn

Lady Rainicorn is a rainicorn and one of Princess Bubblegum's royal steeds, best friend, and companion. She is also Jake's girlfriend, and sometimes follows Finn and Jake on their adventures. She speaks only Korean, using English only when equipped with a Universal Translator (however, she is shown to have spoken a bit of English in "Lady & Peebles"). Princess Bubblegum and Jake are the only other beings in the Land of Ooo, besides Lady's parents, that are shown to understand Korean. In "Lady & Peebles," Lady revealed that she is pregnant; this was confirmed by Princess Bubblegum. In the episode "Jake the Dad" she becomes a mother to 5 puppies.

Appearance
Lady is a long unicorn-like creature. She has a body with the colors from the rainbow like red, yellow, green, blue, violet and pink. She also has a blonde mane, and big round eyes similar to Jake's. She also has a single white, sharply pointed horn. Her mom has a long body like hers, unlike her father. This means that she inherited her length from her mother, since in the episode "Her Parents" her mother and father don't find it odd that Jake can stretch or is long like the females before they know he is a dog. In "Five More Short Graybles" and in "Up a Tree," Lady sported a "baby bump" around the middle of her body.

Abilities
Lady has the ability to fly, phase through walls, and can use her horn to change the color of anything she wants. In the episode "My Two Favorite People," Lady Rainicorn explains to Finn that she can fly because her body can intercept beams of reflected light from the sun and "dance around" on them. In the same episode, she is shown to live in a stable in the Cotton Candy Forest. Like her parents, she can fire a chromatic light beam from her horn, which seemingly hurts. Also, Lady can stretch longer or shorter as you can see when she lands. She may have limited Stretchy Powers. It is revealed in "The Creeps" that she can phase through walls and carry people while phasing. She can play the viola, like Jake.

Personality and traits
Lady is laid-back and likes to interact with Jake and Princess Bubblegum. She is considered Princess Bubblegum's companion, like Jake is Finn's companion. She does not speak Korean in the original short; she only makes soft cooing sounds (or, near the beginning, hysterical screaming coos). However, Jake seems to understand what she says when he talks to her. She believes she is smarter than Jake. She may also have a fondness for Power Rings although she seems to have no fingers. Jake calls her "the rowdy queen," saying she'll try anything.

Lady Rainicorn, unlike both of her parents, doesn't wear a Universal Translator. It is worth noting, however, that Lady Rainicorn understands English, but either barely speaks it or chooses not to. This is obvious because of the fact that neither Jake nor Princess Bubblegum speak Korean very often when talking to her.

Quotes
See Lady Rainicorn/Quotes

Trivia

 * Lady's toy version, as seen in "All the Little People," has a different color scheme than she normally has.
 * In one room of the Princess Bubblegum's castle, there are two pictures of Lady Rainicorn on the wall: One of her upper half, and one of her lower half.
 * Two Rainicorns (both of which look like Lady) appear in the Double Rainbow promo.
 * In the animated short, she spoke in a type of gurgling language instead of in Korean.
 * Other aspects of the Rainicorn people seem to be subtly based on Korean culture and history such as the Korean War, Korean games (i.e. Ethel Rainicorn performs a version of 똥침 "dongchim" on Finn in "Her Parents"), and Korean delicacies.
 * In "The Real You," Princess Bubblegum is seen in the beginning with a yellow t-shirt with a red Rainicorn on it.
 * Lady Rainicorn has a gender-swapped counterpart in the Ice King's fan-fiction: Lord Monochromicorn.
 * Her favorite drink is iced latte as shown in "Video Makers."
 * In "My Two Favorite People" Jake refers to her as "the rowdy queen."
 * In "Apple Thief" Jake cooks Finn traditional Korean food that Lady Rainicorn taught him how to make.
 * Despite being based on a rainbow, Lady Rainicorn's body does not display any orange, but in the animated short she had orange on her body.
 * In "Burning Low," Jake implies that her stomach is 15 feet long.
 * In "Card Wars," it is revealed that Lady Rainicorn used to play Card Wars with Jake, and it made her mad that Jake always won and wanted to do nothing but play it.
 * She can speak some English words, as shown in "Lady & Peebles":"I am pregnant!"
 * As shown in "Lady & Peebles," five small dots and two larger dots appear on the heart monitor. Lady is pregnant, and the five dots indicate her children, who would make their first appearance in "Jake the Dad."
 * Lady has a recurring nightmare about zombies attacking her family. The stress causes her to grind her teeth in her sleep.
 * In "My Two Favorite People," Lady is wearing power rings, even though she does not appear to have any fingers.
 * Lady's colors are in reverse order when compared to a normal rainbow.

Episodes featured
Note: "«" indicates where Lady has a spoken role in the minor appearances. Put in cameo if she does not speak.

Major appearances

 * "Animated Short"
 * "My Two Favorite People"
 * "Her Parents"
 * "From Bad to Worse"
 * "Lady & Peebles"
 * "Jake the Dad"

Minor appearances

 * "Slumber Party Panic" «
 * "The Enchiridion!" (cameo)
 * "What Have You Done" «
 * "Power Animal" (cameo)
 * "Go With Me" (cameo)
 * "Video Makers" «
 * "Mortal Folly" (cameo)
 * "The Creeps" «
 * "Holly Jolly Secrets Part II" (cameo)
 * "Dad's Dungeon" (cameo, in Jake's Imagination)
 * "Dream of Love" (cameo)
 * "King Worm" «
 * "Five More Short Graybles" (cameo)
 * "Up a Tree" «
 * "All the Little People" «

Mentioned and/or drawn

 * "Rainy Day Daydream"
 * "Heat Signature" (Title Card)
 * "Still"
 * "Apple Thief"
 * "No One Can Hear You"
 * "Holly Jolly Secrets Part I"
 * "Paper Pete"
 * "Princess Monster Wife"
 * "Card Wars"
 * "Burning Low"
 * "Little Dude"