Name: Lady Rainicorn
Gender: Female
Age: Unknown
Species: Rainicorn
Lady Rainicorn is a rainicorn and Princess Bubblegum's pet, 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 the end of "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.
Lady is a long unicorn-like creature. She has rainbow colored stripes along her body and a bleach blonde mane. She also has 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. Because Ethel's body is longer than Lady's, and Bob's body is much shorter, it is also possible that Lady has inherited both traits resulting in a body length that is in-between (longer than Bob, shorter than Ethel).