Veronica Sinclair, better known as Roulette, is a cunning supervillain in the DC Comics universe, created by writer Geoff Johns and artist Derec Aucoin. She first appeared in JSA Secret Files and Origins #2 in September 2001. Operating under the alias Roulette—a name tied to her family's criminal legacy, as her grandfather was a Golden Age villain who ran a conventional casino and clashed with the original Mister Terrific—Sinclair established herself as a sophisticated antagonist. She owns and manages "The House," a clandestine arena where supervillains gather to wager on gladiatorial combats involving captured superheroes and metahumans, turning heroism into a profitable spectacle.

Devoid of superhuman abilities, Roulette compensates with exceptional intellect, particularly in probabilistic calculation and strategic manipulation, alongside proficiency in martial arts. She bolsters her security with advanced technology, including robotic guards reminiscent of Apokoliptian designs and elaborate death traps. In her debut arc, she captured members of the Justice Society of America, implanting devices to compel them into brutal fights against one another, all while elite villains placed bets. This scheme highlighted her preference for indirect confrontation, exploiting heroes' vulnerabilities for financial gain and personal amusement.

Subsequent developments saw Roulette engaging in broader criminal enterprises, such as pursuing the mystical Book of Destiny, an endeavor that exposed her to visions of the future and inflicted psychological damage. In the New 52 and Prime Earth continuities, her portrayal shifted toward that of a master thief and casino magnate with an obsessive drive for perfection, positioning her as a direct rival to Catwoman in events like the "Race of Thieves." Despite these evolutions, her core identity as a calculating entrepreneur profiting from chaos remains a defining trait across DC Comics narratives.