Biscuit Krueger, alias Bisky, is a Double-Star Stone Hunter specializing in collecting rare gemstones and jewels, which she frequently names. She typically appears as a young girl with a porcelain doll-like aesthetic, featuring neatly tied-up hair, though her style varies; this form serves a tactical purpose, deceiving opponents by masking her threat. Her true form is that of a large, highly muscular woman, a state she dislikes for its perceived lack of femininity. Despite this aversion, she acknowledges the significant physical strength it provides, while her Nen abilities remain constant in both forms. Her depicted appearance varies between adaptations regarding hair and eye color. Biscuit began learning Nen at 17 and studied Shingen-ryu kung fu, ultimately becoming the teacher of Wing, who later instructed Gon and Killua. She passed the Hunter Exam at an unspecified time and later served as an examiner. Her motivation for journeying to Greed Island was the pursuit of the rare gem Blue Planet. Initially observing Gon and Killua there, she briefly considered disrupting their friendship for amusement. After revealing herself as Wing's mentor, she became their primary Nen instructor. Her personality blends deceptive charm with stern discipline. She often leverages her youthful appearance to manipulate others, gather information, or gain combat advantages. Prone to violent outbursts—especially when ignored or when her age is mentioned—she responds positively to compliments about her looks, as when Kurapika likened her to a princess. She expresses enthusiasm for handsome young men and men's fashion magazines. As a teacher, she employs an unrelenting approach, pushing students to their limits and showing frustration towards wasted potential. Believing high morals can hinder survival in crises, she will kill opponents during combat but avoids unnecessary violence otherwise. In the Greed Island arc, Biscuit designed rigorous Nen training for Gon and Killua. This involved combat sessions using the criminal Binolt as a coerced training dummy; physical conditioning like timed runs and rock-digging; and advanced aura exercises focusing on Ten, Ken, Ko, Shu, and Ryu. She emphasized strategic thinking, such as linking rock-paper-scissors to martial arts principles, inspiring Gon's Nen abilities. She guided their card collection and encounters with antagonists like Genthru, though allowed them autonomy in critical decisions, including Gon's choice to confront Genthru directly. Beyond Greed Island, Biscuit continued mentoring Gon and Killua during the Chimera Ant arc. She confronted Killua's psychological barriers during sparring, insisting he overcome his tendency to flee threats. After Gon's confrontation with Neferpitou left him comatose, Biscuit guarded him in the hospital and later escorted him to meet Ging. She participated in the Hunter Association chairman election, ranking between 9th and 16th in successive voting rounds. Subsequently, Kurapika recruited her as a bodyguard for Prince Marayam during the voyage to the Dark Continent. A theory suggests Ging Freecss may have orchestrated her Greed Island involvement, offering the Blue Planet as payment for training Gon, though this remains speculative within canon sources. After winning the game, Biscuit obtained the gem as her chosen reward but did not disclose this motive during training.