In Roulette’s comic debut, she somehow managed to capture most of the Justice Society of America, and then forced them to fight each other for survival, with increasingly odd and brutal punishments for both the losers and winners as they moved on to the next round of fighting.
Supergirl has chosen a clever use for the character here, seeing as how she’ll be running this underground alien fight club.
In the comics, Roulette is a villain who actually doesn’t have any superpowers.
She’s simply a woman who’s extremely capable of calculating odds and then turned that ability into a penchant for very high stakes gambling, which has made her into quite the foe for anyone who bets against her over the years.