Some cool Cartoon Network fanfiction might involve Ben 10 in a situation where he loses his Omnitrix but still has to fight aliens using his wits and the knowledge he's gained from using it. There could be a fanfic about Dexter's Laboratory where Dexter teams up with Mandark to fight a common enemy that threatens their entire city. Also, a fanfiction about Courage the Cowardly Dog where he has to save Eustace and Muriel from a time - traveling menace would be really exciting.
One idea could be a war between the Powerpuff Girls and the villains from Dexter's Laboratory. Maybe Mandark teams up with Mojo Jojo to create a super - weapon, and the Powerpuff Girls have to use all their strength and wits to stop them. Another idea is a war in the world of Adventure Time, where the Ice King tries to take over all the kingdoms in Ooo with an army of his ice minions. Finn and Jake would then lead a resistance against him.
Another great Funny Cartoon Network Tumblr story could be related to the crossovers that fans dream of. Fans might post about how cool it would be if the characters from 'Ben 10' could team up with the ones from 'Steven Universe'. They would draw fan art or write short stories imagining the interactions between Ben's alien forms and Steven's gem powers, like Ben turning into an alien that can withstand the heat of a gem weapon and helping Steven in a battle.
Maybe the characters are brought together in a strange new world that's a mix of their own. The Powerpuff Girls could meet the Teenage Mutant Ninja Turtles. The Girls' superpowers and the Turtles' ninja skills would make for an exciting dynamic. They could fight against a new villain that threatens this combined world.
One interesting concept could be the meeting of different Cartoon Network characters from various shows. For example, the characters from Adventure Time and Regular Show coming together to solve a problem in a shared universe. This allows for unique interactions and the exploration of how different personalities would mesh.
There's a fanfiction where a dragon from a cartoon forms an unlikely friendship with a human. The dragon has to hide its identity in the human world and they go on adventures together, facing all sorts of problems. For example, when the dragon accidentally uses its magic in public and they have to figure out how to cover it up.
Some avengers cartoon fanfiction focuses on the personal relationships within the team. There could be a story about Thor and Loki's relationship evolving in a different way. Maybe Loki is trying to truly reform and be a part of the Avengers, but the other members are skeptical. This type of fanfiction delves deep into the characters' emotions and how they interact with each other on a more personal level rather than just fighting villains.
The Time Squad could be on a mission to prevent a powerful magical artifact from Fairy Tail's past from being stolen in the present. They enlist the help of the Fairy Tail guild members who are experts in magic and know the history of the artifact. Together, they have to face off against a group of thieves who are also after the artifact for their own evil purposes.
One characteristic is the presence of strong friendships that often develop into love. Like in Steven Universe, Steven and Connie's friendship was the foundation. Another is the use of unique settings. For example, in Adventure Time, the Land of Ooo provided a strange and wonderful backdrop for Finn and Flame Princess's relationship. Also, the characters often have to overcome differences. Flame Princess being a fire - based being and Finn being a humanoid with different abilities meant they had to understand and accept each other's quirks.
In some Avengers network fanfiction, Thor could be stranded on Earth without his powers for a long time. He has to learn to be a hero in a completely different way, relying on his wits and the friendships he's made with the other Avengers. It's a great exploration of Thor's character beyond his godly powers.
Well, 'The Great Race in Cartoon Network City' is quite interesting. It's about all the characters competing in a big race through the city. And there's also 'Cartoon Network City at Night' which shows a different, more mysterious side of the city with some great character development.