Senbei Norimaki, a genius inventor in Penguin Village, was orphaned young and formed an aversion to dogs after one insulted his intellect. He attended Penguin Village Middle School, harboring a crush on his teacher that foreshadowed his later romantic pursuits. Though initially conceived as the protagonist, editorial influence shifted focus to his creation, the robot girl Arale Norimaki, whom he often presents as his younger sister or daughter. His early misadventures include cross-dressing to buy Arale underwear and inventing See-Thru Glasses to study female anatomy for her design, leading to comedic mishaps. Senbei exhibits a persistent, lecherous infatuation with Midori Yamabuki, Arale's teacher. After accidental proposals and awkward courtship, they marry and have a biological son, Turbo Norimaki. Senbei combines scientific brilliance with eccentricity and poor judgment. He frequently invents impractical devices like the Time Slipper, Future Camera, and Big-Small Ray Gun, often driven by base desires like voyeurism or laziness. A recurring gag sees him temporarily transform into a taller, more handsome version during moments of confidence, lasting only three minutes. Despite his flaws, he demonstrates familial devotion, caring for Arale, the winged creature Gatchan hatched from a prehistoric egg, and later Turbo. His inventions frequently trigger major events. The Reality Machine and its successor, the Reality Machine 2, which materializes imagined objects, earn him the "World Invention Award" in *Dragon Ball Super*, surpassing Bulma. He also created a cyborg bear to save an injured animal and Barberman, a malfunctioning robotic hairdresser. In *Dragon Ball* crossovers, Senbei struggles to repair Goku's Dragon Radar during the Red Ribbon Army Saga, requiring Turbo's secret intervention. He later aids Bulma during Arale's rampage in *Dragon Ball Super* by using the Reality Machine 2 to create a food pellet for Beerus. Notably, while featured on promotional material for *Dr. Slump & Arale-chan: Hoyoyo! The City of Dreams, Mechapolis*, he does not appear in the actual movie. Character details vary across adaptations. The 1997 *Dr. Slump* remake alters his motivation for creating Arale, depicting her as a failed attempt to build an attractive maid rather than a sister figure. This version omits Turbo, forcing Senbei to repair the Dragon Radar himself during Goku's visit. His recurring nemesis, Dr. Mashirito modeled after editor Kazuhiko Torishima, frequently targets him, with confrontations resolved by allies like Arale or deities like Beerus.