Crimson Viper is a character that was first introduced to Street Fighter in Street Fighter IV where she was an undercover agent tasked with bringing down the Shadaloo Intimidation Network (S.I.N) from the inside.
She wasn't the most popular character with her biggest triumph being a second place finish at Evo thanks to Latif, but there seems to be a clamor within the FGC to have the player return for Season 2 of Street Fighter 6.
In a survey carried out by Reversal, a fighting game channel, while at Red Bull Kumite, a fair amount of professionals picked C. Viper as the character they wanted back in the game. Players such as Big Bird, Mister Crimson, and Gachikun mentioned her as the character they'd have return with Mister Crimson even intimating that she was the inspiration behind his gamer tag.