There could be a Teletubbies fan fiction where they time - travel. For example, they go back to the time when the first Teletubby was created. They get to see how their world was built and all the efforts that went into making their home. It would be a really cool way to explore their origin in a fictional story.
A fun Teletubbies fan fiction idea is that they become superheroes for a day. Tinky Winky could have the power to stretch really long to reach things, Dipsy could have super speed to run around and save the day, Laa - Laa could fly to rescue those in trouble, and Po could have the power to make everyone happy with her magical laugh.
Maybe in the fanfiction, Snape is on a secret mission to retrieve a powerful magical object that has somehow ended up in the Teletubbies' land. He has to interact with the Teletubbies to find it. Tinky Winky could be the one who unknowingly leads him to the object after Snape helps him fix his bag.
One idea could be a Teletubbies crossover with the Muppets. The Teletubbies' colorful world and simple nature could contrast with the Muppets' more chaotic and diverse personalities. Another could be a crossover with Pokémon. Imagine the Teletubbies exploring the Pokémon world, trying to catch Pokémon with their unique Teletubby powers. A third idea is a crossover with My Little Pony. The Teletubbies could visit Equestria and make new friends among the ponies, sharing their love and hugs in this magical land.
I'm not sure there are truly 'interesting' Teletubbies lemon fanfictions as the Teletubbies are children's characters and such inappropriate fanfictions go against the intended nature of the show. However, if we consider more positive and appropriate fanfiction, there could be ones about the Teletubbies going on adventures in new lands, making new friends, or learning new things. For example, a story where they discover a magical forest full of talking animals and have to solve puzzles to find their way back home.
One interesting Rollo fan fiction could be a story where Rollo discovers a hidden magical power within himself. This power could lead him on an adventure to save his village from an unknown threat.
One interesting Lifeline fan fiction could be about Lifeline's origin story in more detail. Maybe it explores her family background and how she got into the medical field in the first place.
One interesting Akutagawa fan fiction could be a story where he forms an unexpected alliance with a modern - day detective to solve a mystery that has ties to his past works. This would blend his complex character with a contemporary setting.
One interesting Skrillex fan fiction could be about his journey through different music festivals around the world. In this story, he discovers new sounds and collaborates with local musicians.
One interesting Robotech fan fiction could be a story that focuses on the untold adventures of the secondary characters. For example, exploring the backstory of a minor pilot in the Robotech fleet. They might face challenges that the main characters didn't, like dealing with supply shortages on a small, remote ship.
Well, some Warehouse 13 fan fictions involve exploring the backstories of the characters more deeply. For example, a fan fic could delve into Myka's life before she joined Warehouse 13, her family, and how that influenced her. Or there could be a story about Pete's first encounter with an artifact when he was a kid that set him on the path to becoming an agent. And then there are those fan fictions that create new adventures for the team, like they have to deal with an artifact that can control time and they get stuck in different eras.
One interesting natsu fan fiction could be about Natsu going on a solo adventure in a mysterious new land where he discovers a new type of magic. Another might be a story where Natsu has to team up with his enemies to fight a greater evil. There are also fan fictions that focus on Natsu's past and how he came to be in Fairy Tail.