Fu is an artificial life form created by the demon scientist Towa and her creation Mira. Designed as a unique mutant, he possesses DNA from numerous powerful fighters including Goku, Vegeta, Frieza, Cell, Majin Buu, and others. This genetic composition makes him the "ultimate existence" initially intended to destroy the Time Patrol and revive the Demon Realm, though he later pursues independent goals. Physically, Fu has purple skin, red eyes, and white hair with pointed ears reflecting his demon heritage. As a teenager, he sports glasses and a high ponytail, dressed in a mustard-yellow jacket, black pants, and fingerless gloves. His young adult form features hair buzzed on the sides with a slicked-back style or ponytail, wearing a black blazer over a leather shirt, yellow pants, and boots. Technological elements like wristbands and buckles frequently accent his attire. Fu combines scientific curiosity with moral ambiguity. He describes himself as uninterested in fighting, preferring to manipulate history "for science" and absorb personal energy. Claiming to dislike "hopeless, depressing timelines," he expresses a desire for people's happiness, yet employs reckless experimentation across time and space. In *Dragon Ball Xenoverse 2*, he displays a more neutral alignment, opposing outright villainy like Dabura's revenge or Frieza's cruelty. However, in *Super Dragon Ball Heroes*, he becomes openly malevolent, treating individuals as experimental pawns without regard for their well-being. Intellectual obsession defines him, sparking rage when others disrupt his projects and delight when observing battles for data collection. His actions escalate from timeline manipulation to direct multiversal threats. Fu's biography begins in infancy during *Dragon Ball Online*, where Mira's influence suppresses his autonomy. Towa saves him as a baby during the Demon Realm's destruction, intending him to eventually rule the universes. In *Xenoverse 2*, he emerges as a key figure in the "Infinite History Saga," warping historical events—such as swapping Chronoa and Demigra—to harvest energy from paradoxes. He betrays Dabura, who sought to make him the Demon Realm's king, rejecting revenge and kingship to pursue his own agenda. Later, in the "Future Saga," his experiments grow increasingly dangerous, including self-modification that grants him an "Ultra Supervillain" form and drives him to attack Earth alongside corrupted allies. In *Super Dragon Ball Heroes*, Fu orchestrates the "Prison Planet Saga," trapping fighters like Goku, Vegeta, and Future Trunks in a dimensional space of chained planets. He forces them to collect Dragon Balls while observing battles, such as Vegito Blue's clash with Cumber, to fuel his research. His schemes escalate in the "Universe Creation Saga" and "Big Bang Mission," aiming to absorb the energy of all 12 universes to trigger a new Big Bang and create a personalized universe. During these events, Towa infuses him with Mechikabura's "Dark Factor," transforming him into a new Dark King. This power boost allows him to battle fused warriors like Super Saiyan Blue Gogeta and Super Saiyan 4 Limit Breaker Vegito. He later merges with the Universe Tree and the bird-like deity Dogidogi, ascending to near-omnipotent levels before his defeat. Fu wields immense abilities derived from his hybrid physiology and scientific prowess. Base powers include space-time manipulation (e.g., cutting dimensions, creating rifts), sealing magic to imprison foes, energy absorption from historical changes, and analytical prediction via inherited combat data. He employs a sword for techniques like "Confusion Blade" and devices like the "Remote Serious Bomb" to nullify transformations. As Dark King Fu, he gains enhanced space-time slashes, summons Mechikabura's spectral hands for attacks, and manipulates density to immobilize opponents. After absorbing the Universe Tree, he regenerates energy continuously, halves enemy statistics, and creates potent barriers. His tier is classified as "Low 1-C," indicating multiversal influence.