Lady Rainicorn

A Rainicorn or Lady Rainicorn, is a breed of unicorn crossed with a rainbow. She is basically Princess Bubblegum's pet, but more importantly her companion and is concerned with her saftey. She sometimes follows Finn and Jake in their adventures and she can be seen speaking in Korean.

Appearance
Lady Rainicorn is a long unicorn-like creature, with rainbow colors. She has big eyes, similar to Jake's. She also has a blonde mane and a horn. She seems to have the ability to use her horn to change the color of anything she wants which was noted in My Two Favorite People.

Personality
Lady Raincorn is laid-back and likes to interact with Jake and Princess Bubblegum. She's rarely sad or angry. In the Animated Short, she was seen crying in another language. She doesn't speak Korean in the Animated Short; she only makes soft cooing sounds. However, Jake seems to understand what she says when he talks to her.

Jake and Rainicorn
On the official website in Rainicorn's description it says she is Jake's girlfriend and that they get along so well because of their common interest in the viola. At the beginning of Slumber Party Panic, she is shown playfully being chased by Jake, and later in the episode she doesn't seem to mind being locked in a closet for 7 minutes with him. This relationship is also seen in My Two Favorite People.

Rainicorn and Princess Bubblegum
She is usually seen with Princess Bubblegum and lives with her in the Candy Kingdom. She is sometimes described as the Princess' pet.

Trivia

 * Lady Rainicorn is voiced by Dee Bradley Baker in the Animated Short, and she is voiced by Niki Yang in the television series.