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Lumpy Space Princess, or "LSP" for short, is a character in Adventure Time and while more of a spoiled brat (and a stereotypical teenage girl) and not a villainess in the show. 

She is voiced by Pendleton Ward. 

Villainous Roles

She was the final boss in the video game, Adventure Time: Hey Ice King! Why'd You Steal Our Garbage? After Finn and Jake defeat the Ice King, LSP picks up a piece of garbage and realizes that it's an ashtray she made Finn for his birthday and he threw it away. She develops a major tantrum and decides to destroy Ooo by detonating the Lumpy Space Reactor Core. 

She eats some beans, grows huge and opens a portal.  Finn and Jake go in with Lady Rainicorn to try and stop her. LSP's main attack is shooting black stars at Lady Rainicorn in a pattern. Eventually, after dealing enough damage to LSP, the Cosmic Owl appears and uses his energy to turn LSP back to normal.

LSP calms down and then realizes she lives in Ooo and doesn't want to destroy it after all. 

In the series, LSP is the first girl whom Finn has an intimate experience with beyond simply kissing. Just how far they go, however, is not revealed, although Finn is shown lying awake in his sleeping bag shortly after the ordeal, seeming to regret his decision. 

Trivia

  • She is voiced by Pendleton Ward, the creator of Adventure Time.
    • Pendleton Ward admitted that he came up with Lumpy Space Princess's voice by cursing around the office in a valley girl accent.
    • He has also stated that he tries to scream lines as the character because "...that covers up sincere emotion."

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           Adventure Time Villains

GOLB | The Lich | Uncle Gumbald | Ice King | Marceline Abadeer | Lumpy Space Princess | Gunter | Hunson Abadeer | Earl of Lemongrab | Flame Princess | Martin Mertens | Fern | Warren Ampersand | Shoko | Ice Queen | Patience St Pim | Dr. Gross | Magic Man | Betty Grof | Death | Vampire King | The Fool | The Empress | The Hierophant | The Moon | AMO | Flame King | Fire Count | Furnace | Torcho | Fire Kingdom | The Guardian | Gareth | Flying Lettuce Brothers | Tiffany Oiler | Squirrel | Ricardio | Bandit Princess | Samantha | Peace Master | Me-Mow | Pete Sassafras | Ash | Sir Slicer | Scorcher | Mutants | Goliad | Guardians of Sunshine | Fear Feaster | Kee-Oth | Maja the Sky Witch | Darren the Ancient Sleeper | Demon Cat | Bucket Knight | Guardian Angel | Gnome Ruler | Ghost Man | Xergiok | Wendy, Booboo and Georgy | Stag | Princess Cookie | Business Men | Tree Witch | Alpha Hug Wolf | Evil Monster | Donny | Grassy Wizard | Little Dude | Why-Wolves | Candy Zombies | Gnome Fairies | Battle Cubes