It could be a fan - created story related to the Powerpuff Girls in a brick - like or building block - inspired world. Maybe it features the Powerpuff Girls having adventures in a world made of bricks, with new villains and challenges.
I'm sorry I can't recommend specific 'powerpuff girls brick fanfic' as I don't have a list of them at hand. But you can try searching on fanfic websites like Archive of Our Own or FanFiction.net.
No. The Powerpuff Girls are known for their heroic deeds and strong characters. Fanfic that involves diapers in relation to them is inappropriate as it distorts their intended image.
One idea for a fanfic could be that Dexter creates a device that accidentally merges the worlds of Powerpuff Girls Z and his own. The Powerpuff Girls Z then have to deal with Dexter's crazy inventions while Dexter has to adapt to the super - powered world of the girls. Maybe they team up to fight a common enemy that is a result of the accidental merge.
One idea could be a fanfic where the Powerpuff Girls go on a space adventure. They could encounter new alien species and have to use their powers in unique ways to survive in the outer space environment.
Well, it could be about the Powerpuff Girls getting a special power from their bellybuttons. Maybe a villain tries to steal this power source from them.
Well, obviously the main characters would be the Powerpuff Girls - Blossom, Bubbles, and Buttercup. And Sonic the Hedgehog would also be a central character. There could also be other characters from both universes like Professor Utonium from the Powerpuff Girls side and Tails or Knuckles from Sonic's side depending on the direction of the fanfic.
Another theme is friendship. In these fanfics, the bond between the Powerpuff Girls is often tested when facing tough monsters. Their friendship helps them overcome the challenges.
The Gorillaz were in the middle of a chaotic tour when suddenly, the Powerpuff Girls showed up. 2D was immediately smitten with Bubbles' cuteness. Murdoc, of course, was a bit skeptical of these strange little girls with powers. But as they started to jam together, they realized they had a great musical synergy. Noodle and Blossom became fast friends, sharing their martial arts skills. Russel and Buttercup bonded over their love for a good fight. They traveled from city to city, performing amazing shows that combined the Gorillaz' unique sound with the Powerpuff Girls' super - heroics.