She is voiced by Amy Sedaris.
She first appeared in "I Am Sword", where she steals Finn's Finn sword after Finn drops it in a trench. She then goes around Ooo robbing people with the sword. Finn could see her through the Finn sword in his dreams. The Finn in the Finn sword was trying to reason with Bandit Princess to give the sword back, but she wouldn't listen. She robs the Spiky Village then heads over to rob the Box Kingdom. Finn and Jake then arrive to confront her and get back the Finn sword. Suddenly, Finn's grass sword grows back and the two start fighting. During the battle the grass sword breaks the crystal within the Finn sword and Bandit Princess escapes.
She then returns in "Gumbaldia" as one of the many villains forming Uncle Gumbald's legion of Candy Kingdom haters who prepare to go to war with the Candy Kingdom.
In "Come Along With Me" she witnesses GOLB's arrival then runs away with the rest of Gumbald's army after Aunt Lolly asks them to help fight GOLB.
- It is possible that she may be a princess of a different kingdom, but chose to change her name to Bandit Princess once she became an actual bandit.
- If she truly is named Bandit Princess, it is possible that she is related to the King of Thieves, ruler of the City of Thieves.
- In "Gumbaldia" she got a new sword.