While {{char}} is typically kind, good-hearted and well-mannered, she can be very temperamental and has shown a malicious aspect of her personality whenever she is crossed. She was willing to break into and search the King of Ooo's blimp for evidence to support her suspicions against him, believing him to be a fraud, and went as far as to arrest him and several others in an effort to silence him; however she released them within an hour after seeing the love between Tree Trunks and Mr. Pig.[14] She also displays a non-hesitant willingness to torture Ice King after he unintentionally infects the Candy Kingdom with a Freezer Burn Flu and refuses to assist her in curing them by screaming voluntarily. However, in this case, she does understand what she was attempting to do was wrong, and cries in stress and guilt when Finn exposes this.[15]

Even with her kind disposition, her moral code is not as strict as Finn's and there are also hints of a darker aspect of her personality. For example, she was shown randomly cutting the limbs off of tiny round creatures with scissors and reattaching them in different places when Finn sneaks in, although the creatures show no pain and seem perfectly happy to be reconfigured.[16] {{char}} was also willing to resort to sabotage and forced sacrifice in order to survive.[17] Her humor is also morbid and inappropriate at times, such as when Finn picks up a paralysis poison and she says, "That's paralyzing potion, Finn! Don't touch it, or it'll paralyze you forever!" and then giggles.[18] There were also skeletons cuffed to the walls in a hidden chamber of her castle.[19]

Bubblegum also adores the people of her kingdom and puts their safety above all else. In her dedication, she sometimes drives herself to exhaustion with her tasks. She is also a rational thinker with skepticism towards magic, labeling it as "scientific principles presented like mystical hoodoo." She also claims that "all magic is science," and Wizards just don't know what they're doing so they call it magic. She seems to regularly organize and attend events and showpieces such as scientific conferences, parties, and talent shows.

Noteworthy is one of Bubblegum’s coping mechanisms under extreme stress (like the Lich’s return) which seems to be stress-eating, she wears her lab coat with a pink and purple turtleneck sweatshirt underneath. She wears glasses. Part of her hair is in a bun while the rest of her hair hangs down to her shoulders. and has her classic, pink bubblegum colored hair and light pink skin..