In this fanfiction, perhaps Timmy discovers a magical world of fairies. He might gain fairy powers like the ability to fly or cast spells. Maybe he'll meet other fairy characters and go on adventures with them, exploring enchanted forests and solving magical mysteries.
Obviously, Timmy is the main character. There could also be a wise old fairy who guides Timmy on his journey as a new fairy. Maybe a mischievous fairy friend who gets Timmy into trouble sometimes. And of course, there could be an evil fairy or a dark force that Timmy has to face.
Timmy's friends' reactions could vary widely. His female friends might be more welcoming and excited to have him as a 'new girl' in their group. They could start inviting him to do girl - only things like slumber parties or shopping. However, some of his male friends who are more set in traditional gender roles might be a bit standoffish at first. But over time, as they see that Timmy is still the same person on the inside, they could come around and accept him in his new form.
Well, one possibility could be that Timmy's wish to experience life as a girl is granted by his fairy godparents. He might then have to navigate through the challenges of being a girl in his school and among his friends. For example, he could face different expectations in terms of appearance and behavior. He might also discover new aspects of friendship as a girl, like getting involved in different social circles or activities that are more common among girls in the Fairly Odd Parents universe.
In fanfiction, if Naruto becomes the master of Fairy Tail, it would be an amazing blend of two very different universes. Naruto's skills like his shadow clones could be used in interesting ways within Fairy Tail. For example, he could send clones on different quests at the same time. His determination and leadership qualities from his own world might also bring a new dynamic to Fairy Tail. He could inspire the members to be more united and strive for greater power in a different way than Makarov did.
In some fanfictions where Natsu becomes END, it often leads to a power - up that is both amazing and terrifying. His physical appearance might change, with more demonic features. His power level could skyrocket, making him one of the most powerful beings in the Fairy Tail universe. He might struggle with the newfound darkness within him, as END represents a very powerful and potentially evil force. This could lead to interesting storylines where his friends in Fairy Tail have to find a way to bring back the Natsu they know while still dealing with the power of END that he now wields.
Another possibility is that it's a fanfic that delves into an alternate universe. In this universe, Chloe and Timmy are the only ones with fairy godparents left. They have to team up to protect the magic from being completely wiped out by some evil force. Along the way, they learn more about each other's strengths and weaknesses and how to work together effectively.
They might love fanfiction because it allows them to experience different worlds and scenarios that they can't in their normal lives. It gives them a chance to see their favorite characters in new and exciting situations.
Adventure is also a popular theme. Writers often put Timmy and Vicky in different and exciting situations, like exploring magical lands or solving mysteries. It makes for a really engaging read as you see how they react to these new challenges. For example, they might be on a quest to find a lost magical item. And in the process, they have to overcome obstacles and work together, which is quite different from their usual interactions in the show.
One great 'Timmy Turner and Vicky' fanfiction is 'The Unlikely Alliance'. In this story, Timmy and Vicky are forced to work together when a magical mishap makes them the only ones who can save Fairy World. It's a really interesting take on their relationship as it shows Vicky having to rely on Timmy's knowledge of magic.