Butterbelle

ButterBelle is the femslash ship between Buttercup and Princess Bluebelle from The Powerpuff Girls fandom.

Canon
In the episode "Once Upon a Townsville", Buttercup mistakes Bluebelle for a Zombie. Bluebelle, thinking that Buttercup is Prince Charming, kisses her, before realizing that she is not a prince. Their relationship is not explored throughout the rest of the episode though.

Fanon
Due to the kiss between the two, despite the age gap between them, many people have shipped them together. The ship is relatively small. Some fanart has been made. As Bluebelle only appears in one episode, the ship is not extremely well known.