Lady Rainicorn is Princess Bubblegum's pet and friend, and Jake's girlfriend. She is voiced by Niki Yang, and Dee Bradley Baker in the Animated Short.
- Lady Rainicorn speaks Korean.
- Lady Rainicorn is voiced by Niki Yang, but in the pilot she was voiced by Dee Bradley Baker.
- In the pilot, instead of speaking Korean, she speaked gibberous, probley to let her talk in Korean accent, to give her more appeal.