I know it won't happen but I find it fun to come up with these ideas!
I feel the Sprunkis would be special backblings (stuff players wears on their backs) fully animated of course. Then they'd have built-in emotes where the player holds out their Sprunki out and they would play their sounds. Other players with Sprunkis would join in like a jam-session. They would also switch to their dark versions if it doesn't go against the game's rating. I would think Black would cause the switch if used but I feel players would troll with that. Also, each would be 400 VBucks but they would give each player one of their choice for free.