Buttercup is the third main character of the animated television series The Powerpuff Girls, along with her sisters Blossom and Bubbles. She was shown as the Toughest Fighter, she's the bravest, most headstrong of this superhero trio. So when she said No!, that means no. If you are stubborn like this girl, then you have to have this The Powerpuff Girls Buttercup No Sticker for sure.