Princess Bubblegum (full name Princess Bonnibel Bubblegum, often called PB and on occasion Peebles or Poibles) is a main character on the series Adventure Time that first appeared in the Animated Short. She is the benevolent ruler of the Candy Kingdom, and was Finn's former love interest. Marceline calls her by her first name, Bonnibel. At the end of "Mortal Recoil," she was transformed into a 13-year-old, but returned to her normal biological age of 18 years in "Too Young."
~♔ Bonnibel Bubblegum's Biography♔~
Princess Bonnibel Bubblegum is the beloved ruler of the Candy Kingdom. Though not much is said about her past, there are some allusions to her relatives (e.g. Uncle Gumbald, mentioned in "Susan Strong"). It is implied that Finn has saved Princess Bubblegum many times, though she winds up saving him in the episode, "Dungeon." It also seems that she has had previous run-ins with Marceline, the vampire queen. In the past she created Lemongrab (the first one of her experiments gone wrong), then sends him away to live a sheltered life inside of a castle. Princess Bubblegum also performs other science experiments which vary greatly in their success, ranging from very successful to catastrophic.
In Season Two's two-part finale, "Mortal Folly" and "Mortal Recoil," she sends Finn and Jake on a quest to stop The Lich from killing everyone in Ooo. She gives Finn The Gauntlet of the Hero Billy as the only known weapon that can harm The Lich, and a sweater she made herself. The Ice King captures Princess Bubblegum and chases after Finn and Jake to get their blessing to marry her, but he accidentally dropping the Princess into a pit of green liquid. She is soon melted into a pile of pink-brown goo and is rushed to the hospital.
It is soon revealed that the spirit of The Lich possessed the Princess earlier and eventually warps her into a giant monster that nearly tears apart the Candy Kingdom. Finn enlists the power of Ice King to immobilize her with ice. Unfortunately, the frozen Princess topples over and breaks to pieces. The doctors reassemble her but lack all the necessary pieces, reducing her age to 13 (the same age as Finn at the time). According to Adam Muto, her body was composed of only enough reclaimed biomass to be an adolescent, and therefore she turned into one.
With her new age Princess Bubblegum is technically younger than the Earl of Lemongrab and he claims his right to the Throne until she turns 18 again. Princess Bubblegum is forced to restore herself to her 18-year-old form with the contribution of biomass (candy) from the Candy People and a hug (and kiss) from Finn. After reverting to her proper age and size in "Too Young" she jokingly acts as if the events that happened earlier that same day (while she was 13) actually happened five years ago.
~♔Personality and traits♔~
Princess Bubblegum is an amiable and nice ruler. She loves (most of) her subjects and has been known to defend them tirelessly when trouble brews. In "Princess Cookie," her dedication to her Kingdom is shown when she visits a Candy Orphanage and spends some time cheering up the children.
Princess Bubblegum has a strong sense of morality and participates in politics outside the Candy Kingdom. She is very noble.
Princess Bubblegum is a highly cultured and educated ruler with an undying passion for science. In "Slumber Party Panic," she attempts to revive the dead Candy People, accidentally creating a horde of zombie Candy People instead. In her dedication, she sometimes drives herself to exhaustion with her experiments such as the perfect sandwich in "Five Short Graybles" and "Goliad."
Though ordinarily sweet and good-natured, Princess Bubblegum shows a malicious aspect of her personality whenever she is crossed, as toward the Duke of Nuts for eating all of the royal pudding and supposedly ruining her appearance. Even with her kind disposition, her moral code is not as strict as Finn's. She sometimes says morbid or inappropriate things, such as when Finn picks up a paralysis poison and she says, "Don't touch that Finn, it'll paralyze you forever!" and then giggles. Many darker things are briefly shown in several episodes such as skeletons cuffed to the walls in hidden chambers as shown in "Ricardio the Heart Guy." Also, in "What Have You Done?," she displays a willingness to torture Ice King.
When she is 13 years old in "Too Young," she exhibits a playful attitude and a willingness to perform pranks with Finn. Just before Princess Bubblegum is returned to her normal age she mentions that she enjoyed temporarily being 13 because she was free from the responsibilities that came with being ruler of the Candy Kingdom and that she could act like a kid again. In Princess Bubblegum's own words, being thirteen was "bloobalooby."
Princess Bubblegum acts noticeably more child-like when she is not in her role as the princess. She dresses and talks more casually when she isn't busy with her work, as seen in "Video Makers" and "What Was Missing." As a princess, she is prim, poised, and straight-laced, but is quite capable of loosening up and dressing/acting like a regular teenager with her friends.
She regularly organizes and attends events and showpieces such as scientific conferences, parties, and talent shows.
After the events in "Mortal Recoil," Princess Bubblegum is afraid of her own mortality. She worries what would become of the Candy Kingdom should she die, as pointed out in the episode Goliad (no reference is made to the Earl of Lemongrab returning), She considers the possibility of living forever is not scientifically possible yet so she creates an heir in the form of Goliad.