Jenny, whose name is rendered as Janny or Jani in some sources, serves as the heavy weapons specialist and the muscle of the Sol Bianca crew, a group of five female space pirates operating a technologically advanced starship of the same name. Her primary domain on the ship is the weapons station, where she is responsible for directing the vessel's considerable firepower. Her personality is characterized by a hot temper and a brash, foul-mouthed demeanor, making her the most quick to anger and easily irritated member of the crew. She is exceptionally confident in her combat abilities and often charges headlong into dangerous situations with a heavy arsenal, sometimes acting as the primary rescuer when her comrades are in peril. Despite her aggressive exterior, she is a core and loyal part of the pirate family.

Jenny possesses a deep and practical familiarity with a wide variety of weapons, powered armor suits, and vehicles, which is her most notable ability. In addition to her gunnery post, she is also capable of piloting the Sol Bianca when necessary. Among the crew, her most significant and consistently portrayed relationship is one of mutual antagonism with June, the team's computer expert, with the two frequently engaging in bickering and not getting along. Her background before joining the crew remains largely unknown to her shipmates, though hints of her past life exist; at one point, June hacks into a personal diary that contains pictures from Jenny's previous life, suggesting a hidden history she keeps to herself. Jenny shows little development over the course of the story, remaining the steadfast and dependable heavy fighter for the group, and her motivations are consistently aligned with the crew's goals of acquiring treasure and surviving their dangerous escapades.