One common theme is the Tooth Fairy's relationship with the other magical characters in The Fairly OddParents universe. For example, how she interacts with Cosmo and Wanda.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide variety of fanfictions, including those related to The Fairly OddParents and the Tooth Fairy. Just use their search functions and type in relevant keywords.
One common theme is self - discovery. The oc characters often have to figure out who they are and what their place is in the magical world of Dimmsdale. Another theme is friendship, as they usually form bonds with the existing characters like Timmy.
The exploration of new powers and abilities is common too. In a crossover with 'Avatar: The Last Airbender', the fairies' magic could be compared and combined with bending. This allows for new and exciting scenarios where the characters discover how their powers can either complement or conflict with each other.
A common theme is the crossover of different worlds. Since Fairly OddParents has a magical, comical world and Danny Phantom is set in a more spooky, ghost - filled world, the clash and combination of these two is often explored.
One common theme is friendship. For example, stories might focus on Timmy's friendship with his human friends like Chester and AJ, and how they get into and out of various adventures together. Another theme could be the relationship between Timmy and his fairy godparents. There are fanfics that explore how they learn to understand each other better over time.
Well, you could write a 'fairly oddparents fanfiction' where the roles are reversed. For instance, the fairies become the ones in need of help and Timmy has to use his non - magical human skills to save them. Or perhaps a story set in the future where Timmy has grown up and is now a fairy godparent himself, and he has to guide a new, young kid. You could also do a crossover with another kids' show universe, like having some characters from that universe end up in Dimmsdale and interact with the 'fairly oddparents' characters.
One interesting storyline could be Timmy Turner using his fairy godparents' wishes in creative ways to solve problems in the human and fairy world simultaneously. For example, he might wish for a device that can translate all languages so that he can communicate with fairies from different regions and help them resolve misunderstandings. Another could be a story where Vicky, his babysitter, gets a taste of her own medicine through a wish gone wrong and has to experience what it's like to be in Timmy's shoes for a day.
One popular 'Fairly OddParents' fanfic could be those that explore what would happen if Timmy had different godparents with unique powers. For example, a fanfic might introduce a godparent who can control time and how that would change the dynamics of Timmy's wishes and adventures.
Maybe an OC who comes from a long - lost family of fairies. This OC could be on a quest to discover their family's past and their rightful place in the fairy world. They could encounter various characters from the Fairly OddParents universe along the way and have all sorts of adventures with them.
One idea could be a crossover with 'The Powerpuff Girls'. The Fairly OddParents' magic could interact with the superpowers of the Powerpuff Girls in really fun ways. For example, Timmy could wish for super strength like Buttercup, but with a magical twist. Maybe his strength would be based on how many good deeds he's done recently.