Bambietta Basterbine is a Quincy and a member of the Wandenreich's Sternritter with the designation E: The Explode.[1][2] She is also the self-appointed leader of the Sternritter's female members. Bambietta is a slender young girl with long, straight, dark brown hair and brown eyes.[3] Her attire is a variation of the Sternritter's typical white uniform, consisting of the order's signature hooded cloak, a thigh-length trench coat, knee-high boots, a miniskirt, and black stockings with a red trim on her gloves and boots.[4][3] She wears a red heart-shaped belt buckle and a white cap with gold[3] trimmings, which features a black peak and the Wandenreich insignia emblazoned on its front.[5] Bambietta is a particularly sadistic individual, evident in how she screams in joy as she slaughters her enemies.[1] She is not above attacking her male subordinates to vent her frustration, sometimes bringing them into her room for "special relief" before killing them without remorse.[6] She does not believe in fighting if one has already thrown away one's life.[7] Bambietta refers to herself as the self proclaimed "leader" between her and some of her fellow Sternritter, and dislikes being abandoned by them and finds it quite embarrassing. In such cases she detonates the nearby environment in a destructive manner and implies she will reduce the area to flat land to bring them out.[8]

Bambietta has a strong sense of survival and self-preservation; during her second fight against Sajin Komamura, Bambietta was unable to understand the reasons for the lengths he went through in order to increase his power to kill Yhwach by offering his heart, with her stating her belief that the point of fighting is people not wanting want to die and thus finding it incomprehensible for someone to throw away their life just to win a battle.[9] Later after being severely injured by Komamura, Bambietta fell into panic due to knowing full well the repercussion of being defeated for a Sternritter and stating that she refuses to let it end like this.