Lui Shirosagi, recognized in Japan as Lui Shirasagijo, dominates Beyblade tournaments with unmatched skill and a reputation for crushing victories. Initially appearing as a short, pale-skinned figure with striking light-blue and white hair, violet eyes, and sharp teeth, his physique matures in *Beyblade Burst Turbo* into a taller frame. His updated attire pairs a sky-blue shirt adorned with violet diamond motifs, dark-blue pants, and a flowing white winter coat, replacing his earlier feather boa. Lengthened hair accentuates his sharp features, while his Beyblade, Brutal Lúinor 13 Jolt, mirrors his ferocious combat style. A five-time consecutive National Champion, Lui overpowers rivals like Valt Aoi and Shu Kurenai, dismissing opponents he deems unworthy while reserving his full intensity for those who challenge his prowess. His initial disdain for Valt’s perceived lack of synchronization with Victory Valtryek shifts after their climactic *Turbo* battle ends in a stadium-destroying stalemate, prompting reluctant acknowledgment of Valt’s growth. Merging calculated aggression with ruthless tactics, Lui cripples adversaries’ Beyblades—notably shattering Spryzen—and injures Shu during clashes. Yet he paradoxically refuses to engage wounded opponents, adhering to a personal honor code. This duality softens in *Turbo*; intrigued by Aiger Akabane’s resemblance to Valt, he displays rare respect, congratulating Aiger on a hard-fought loss and gifting a Level Chip for future battles. His Beyblades evolve alongside his ambitions: Lost Lúinor Nine Spiral gives way to Nightmare Lúinor Destroy in *Evolution*, then Brutal Lúinor 13 Jolt in *Turbo*. Each iteration unleashes devastating techniques like *Lost Spiral* and *Brutal Squall*, blending breakneck speed with raw destructive force. Though favoring relentless assaults, he adapts strategies to exploit rivals’ weaknesses. Originating as a transfer student drawn to the Bey Club after observing Gabe Brunai’s training, Lui ascends to elite ranks within the Supreme Four and Rideout team. Flashbacks reveal his flawless fourth championship victory against Shu, cementing his untouchable status. Later retreats to icy isolation for rigorous training underscore his obsession with power. By *Beyblade Burst Surge* and *QuadDrive*, his demeanor shifts toward camaraderie, exemplified by rescuing Hyuga Hizashi mid-battle. His arsenal advances with Raid Lúinor Destroy' 3A and Guilty Lúinor Karma Metal Destroy-2, proving his relentless adaptation in the ever-evolving Beyblade arena.