5/6 is her starting point and where most of her stories take place and where the Villainpuffs originate from 10/11 the Villainpuffs are still going strong, but the girls' personalities start developing more. Viper becomes more "cool" and unknowingly gets a fanbase 15/16 the Villainpuffs start fading as the girls' focus on their futures as well as realize exactly what they were supporting (AKA: realizing they supported underdogs who deserve better and not lunatics bent on world destruction). Viper goes back to her gang roots at this point. 20/21 the Villainpuffs have disbanded and Viper herself leaves the Gangreen Gang to travel and figure out who she is as an individual rather than a group member.
new note: Viper would totally be voiced by Jessica Dicicco