They could also interact in a more everyday - life - like way. Imagine the Gorillaz inviting the Powerpuff Girls to their home. Bubbles would be excited to see all the cool musical instruments. Blossom would be interested in their creative process. Buttercup might get into a friendly wrestling match with Russel. 2D could draw pictures of the Powerpuff Girls, and Murdoc would try to convince them to be part of his next big scheme. Noodle could cook a meal for everyone, and they would all share stories about their different worlds.
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 plot twist could be that the Powerpuff Girls Z lose their powers temporarily. Dexter then has to use his inventions to protect them and the city. But as he does so, he realizes that he can't do it alone and that the girls' powers are more than just physical strength. It could be a story about Dexter growing to respect the girls in a new way and the girls learning to rely on Dexter in a different way than just for his inventions.
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.
The Powerpuff Girls Z themselves - Blossom, Bubbles, and Buttercup are often very popular. Fans love to write about their different personalities and how they interact with each other. For example, Blossom's leadership, Bubbles' kindness, and Buttercup's tough - girl attitude. Also, the villains like Mojo Jojo can be popular. His devious plans and his rivalry with the girls make for interesting stories in fanfic.
One interesting storyline could be the Powerpuff Girls Z facing a new, super - powerful villain from another dimension. This villain has powers that are the opposite of theirs and can manipulate time, causing chaos in Townsville. Another could be a story where they lose their powers temporarily and have to rely on their wits and teamwork to save the day. Maybe they team up with some of their former enemies who also realize the new threat is too great for them to handle alone.
I'm not sure there are really 'interesting' aspects in this as it might seem a bit of an odd or inappropriate concept. The Powerpuff Girls are meant to be strong, independent superheroes, and focusing on such a strange idea like 'diaper fanfic' goes against their original positive and empowering image.
The main characters are likely still the Powerpuff Girls - Blossom, Bubbles, and Buttercup. Even though they are'more than human' in this fanfic, they would remain the central focus of the story.