An OC that is a magical creature from another dimension who gets stuck in Timmy's world would be cool. This OC could have unique powers that Timmy has never seen before. They could help Timmy understand more about the wider magical universe. Or an OC who is a time - traveling fairy who comes to Timmy's time to correct a mistake in the past that is affecting the present of the magical world.
You could make an OC who is an aspiring fairy - in - training. This OC could be clumsy at first but has a heart of gold. They could end up getting assigned to Timmy by mistake instead of Cosmo and Wanda. This would lead to all sorts of comical situations as the inexperienced fairy tries to grant Timmy's wishes. Also, an OC that is a villain's sidekick who has a change of heart and decides to help Timmy could be an interesting plot.
One idea could be creating an OC who is a long - lost relative of Timmy. Maybe a cousin from a far - off magical land who comes to visit. This OC could bring new magical adventures and challenges for Timmy and his fairies. Another idea is an OC that is a new student at Timmy's school who has a secret power related to wishes. They could team up with Timmy to solve school - related problems in a magical way.
One idea could be creating an OC who is a long - lost relative of Timmy. Maybe this relative has some unique magical abilities that are different from Cosmo and Wanda's. For example, they can manipulate time in a small way, like slowing it down for a short period to help Timmy study for a test.
One idea could be to create a fanfic where Timmy wishes for a time - traveling adventure with his fairies. He could go back to the days when his parents were kids and see how they were like then. Another idea is to have a story where Cosmo and Wanda accidentally switch powers with other magical creatures in Fairy World and Timmy has to help them get their powers back while dealing with the chaos it creates.
One idea could be a story where Timmy's new baby sibling gets fairy godparents too. Maybe they have some really unique wishes that cause all sorts of wacky adventures in Dimmsdale. Another could be a fanfiction where the baby is actually a magical being in disguise and the fairies have to protect it from evil forces.
One idea could be a crossover with 'The Powerpuff Girls'. Timmy Turner could meet the Powerpuff Girls and they could team up to fight an evil villain that combines the magic of Fairy World with the chaos of Townsville. Maybe Mojo Jojo teams up with Vicky to cause trouble and the combined forces of Timmy's fairies and the Powerpuff Girls are needed to stop them.
I'm not sure specifically which lemon fanfictions are considered interesting as they often go against the original family - friendly nature of 'Fairly Odd Parents'. However, some might explore alternate relationships between characters in a more creative but still non - inappropriate way, like imagining different adventures for Timmy and his fairies that are not in the canon but still keep the essence of friendship and magic.
One interesting concept is alternate timelines. For example, what if Timmy had different fairy godparents? Another could be crossovers with other shows. It's really cool to see the characters from Fairly Odd Parents interact with characters from different universes.
Another plot idea is that Vicky from Fairly Odd Parents somehow gets some ghost - hunting equipment and decides to hunt Danny. Danny, thinking she's just another annoying human at first, soon realizes she's more of a threat than he thought. Meanwhile, Timmy has to try and stop Vicky without getting in Danny's way or revealing the existence of fairies.
One idea could be exploring how Cosmo's pregnancy affects his relationship with Wanda. Maybe he becomes overly protective or more sensitive. Another could be the chaos it causes in Fairy World, like how the other fairies react to the news.
The 'Fairly Odd Parents' is an animated series. It mainly follows the adventures of a boy named Timmy Turner. He has two fairy godparents, Cosmo and Wanda, who can grant his wishes. The show is filled with wacky situations, magic, and lessons about growing up. It often shows how Timmy uses his wishes in creative but sometimes troublesome ways, and how he gets out of the messes those wishes create.
There might be a fan fiction where Vicki discovers the existence of the fairies but instead of using them for selfish reasons like Timmy, she tries to use their magic to rule the school in a more tyrannical way. This would create a whole new dynamic and conflict in the 'Fairly Odd Parents' universe.