Biscuit Krueger, known as Bisky, is a Double-Star Stone Hunter certified by the Hunter Association. She typically presents as a young girl with a porcelain-doll aesthetic and neatly tied hair, a deliberate disguise maintained through Nen ability. This form offers tactical combat advantages by misleading opponents and aligns with her personal preference, as she dislikes her true form: that of a large, extremely muscular woman. She reverts to this powerful state during serious combat, significantly boosting her physical strength while maintaining consistent Nen levels. Her hair is brown with blue eyes in the manga; anime adaptations sometimes show lighter brown or blonde hair and pink eyes. Her personality blends strategic deception with stern professionalism. She leverages her childlike appearance to gather information, manipulate situations, and provoke underestimation, often displaying a devious sense of humor. This included an initial desire to disrupt Gon and Killua's friendship for amusement. However, she exhibits violent outbursts when ignored or when her true age is mentioned. Compliments comparing her to a princess readily sway her. Professionally, she maintains a no-nonsense attitude toward martial arts and training, showing no hesitation to kill in combat and relentlessly pushing students to their limits. She harbors deep frustration toward individuals wasting their potential and finds fulfillment in cultivating talent. Outside combat, she collects precious stones and gems, often naming them, and expresses keen interest in handsome young men and men's fashion magazines. She learned Nen at 17, studied Shingen-ryu kung fu, became Wing's master, passed the Hunter Exam at an unspecified time, and later served as an examiner. She describes herself as a lifelong proficient liar. Her primary motivation for entering Greed Island was obtaining the rare gem "Blue Planet." Within Greed Island, she joined Battera's recruitment challenge to clear the game. After passing Tsezguerra's test, she observed Gon and Killua, intrigued by their potential. Following initial rejection by Killua, she persistently followed them, intervening during their monster struggles to offer guidance on Nen techniques like Gyo. She formally introduced herself as Wing's teacher and initiated rigorous training after subduing the murderer Binolt, whom she forced to serve as a live training dummy under threat of death. Her methods included extreme physical conditioning like timed runs, rock-digging, endurance exercises with suspended rocks during sleep, and combat drills focused on foundational Nen principles (Ten, Zetsu, Ren, Hatsu) and type-specific advanced techniques (Ryu, Ko, Ken). She compressed planned months of training into weeks based on their rapid progress. She also provided strategic insights during their confrontation with Genthru the Bomber and assisted in deciphering the game's mechanics, including spell card acquisition and usage. Her mentorship continued into the Chimera Ant arc, where she resumed training Gon and Killua. She employed specialized Nen abilities to accelerate their recovery and training intensity. Her "Piano Massage" technique conjured a Nen masseuse named Cookie, drastically reducing required rest by alleviating fatigue and restoring aura, enabling near-continuous training. She participated in strategic planning with the Hunter Association's extermination team, contributing her analytical skills against the Chimera Ant threat. As a Nen user categorized as a Transmuter, she demonstrates high proficiency across all Nen types: Emission, Enhancement, Manipulation, and Conjuration. Her signature Hatsu abilities are non-combat: "Piano Massage" conjures Cookie for restoration, while "Magical Spa Services" creates a rejuvenating bath. Despite this, her combat prowess is significant. In her true form, she delivers devastating physical attacks, exemplified by easily incapacitating Binolt and surviving powerful strikes from adversaries like Bara with minor injuries. Her speed and reflexes allow her to track Gon and Killua effortlessly and participate in high-velocity contests like Razor's dodgeball game uninjured. Her tactical acumen is evident in devising successful strategies against foes like the Bombers. Her development shows a shift from viewing Gon and Killua as amusing projects to developing genuine, almost parental concern for their well-being, an attachment she acknowledged by Greed Island's conclusion. Her interactions reveal a complex relationship with her identity; she strategically utilizes her deceptive youthful form yet harbors deep-seated dissatisfaction with her true muscular physique, deeming it incongruent with her feminine ideals.