|Vehicles and/or Gadgets||None|
|Occupation|| Princess Bubblegum's Royal Transport
Mother to Jake's children
She is a female Rainicorn and Princess Bubblegum's royal steed, 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 device (however, she is shown to have spoken a bit of English in "Lady & Peebles" "I am pregnant!"). Princess Bubblegum, Lady's children, and Jake are the only other beings in the Land of Ooo, besides Lady's parents, that are shown to understand Korean. Finn directly refers to the language she speaks as Korean in "The Pit." 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 five rainbow puppies.
- In the TV show, she is voiced by Niki Yang who also voiced BMO in the show. She returns to voice both Lady Rainicorn and BMO in this game.
- Dee Bradley Baker, who voices Cinnamon Bun in the show, voiced her in the pilot short where she speaks only dove coos rather than in Korean.
- She can be seen serving as a transport for Princess Bubblegum in the opening cutscene of A Book and a Bad Guy.
- She is also seen flying around Candy Kingdom during the first part of the Mortal Folly segment in the A Book and a Bad Guy level.