What are some interesting ideas for ninja turtles fanfiction?

Perhaps a fanfiction where the human Ninja Turtles travel back in time to the era when the original turtles were created. They could interact with the mutagen that made the turtles what they are and maybe change the course of their own existence in some way. For example, they could try to prevent certain villains from ever being created.

A crossover with the X - Men could also be cool. Picture the Turtles in the mutant - filled world of the X - Men. They might have to deal with the complex politics of mutants while also facing off against villains like Magneto. The Turtles could learn from the X - Men's experience in dealing with a world that fears and hates mutants, and vice versa.

One idea could be a human character who discovers the Ninja Turtles' lair by accident and has to prove they can be trusted. Maybe they help the turtles in a battle against a new enemy, like a mutated creature from the sewers that the turtles hadn't faced before.

Another possibility is a crossover with the Ghostbusters. The Turtles and the Ghostbusters could join forces in New York City. The Turtles' knowledge of the sewers and the Ghostbusters' ghost - busting equipment would be a great combination to deal with some spooky paranormal activity in the city.

One idea could be a story where the Teenage Mutant Ninja Turtles discover a hidden mecha technology in the sewers. They have to figure out how to use it to defeat a new, powerful enemy. Maybe it gives them new abilities like enhanced speed or the power to fly.

One idea could be exploring the turtles' origin in more depth from a different perspective. Maybe a new character discovers a hidden aspect of their mutation process.

Maybe the human sister is a scientist who is working on a project that could potentially help the Ninja Turtles in their fight against evil. But the bad guys find out about it and try to stop her. Or she could be an artist who uses her art to inspire the Turtles and give them new ideas for their strategies. She might also have a secret past that is somehow connected to the mutagen that created the Turtles.

One idea could be that the Pokemon trainers are in the world of the Teenage Mutant Ninja Turtles. They could team up with the turtles to fight against a common enemy, like an evil organization that is trying to take over both the Pokemon world and New York. For example, Team Rocket could be working with some of the villains from the TMNT universe.

One idea could be a crossover with the Power Rangers. The Turtles and the Rangers could team up to fight a common enemy like an alien invasion. The Rangers' high - tech weapons and the Turtles' ninja skills would make for an exciting combination.

One idea could be a story where the turtles become human for a day and have to navigate high school. They'd struggle with normal teenage things like fitting in and dealing with bullies, all while trying to hide their turtle identities.