One interesting Ninja Turtles fanfic could be about the turtles exploring a new dimension. It might have them facing off against new and strange enemies that they've never encountered before. This would test their skills in different ways and also give the writer a chance to create really unique settings and characters.
There are fanfics that focus on the relationships between the turtles themselves. For example, a story about how they handle an argument that threatens to split them up. It could show their individual personalities coming into play as they try to resolve their differences, which is a great way to explore their characters more deeply.
A really cool idea for ninja turtles fanfiction would be to have a story set in a post - apocalyptic New York. The Turtles would have to deal with new threats that emerged after the world as they knew it was destroyed. They might have to face mutated versions of ordinary animals and humans that are far more dangerous. There could also be a sub - plot about the Turtles trying to find other survivors and rebuild some sort of community. This would give a chance to explore their leadership skills and how they adapt to a completely different environment.
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.
I'm not really into lemon fanfictions as they often involve inappropriate content. But generally, Ninja Turtles fanfictions can range from adventures that the turtles go on, like facing a new and powerful enemy in the sewers of New York. They might also involve new character relationships and how they interact with the turtles' human friends.
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.
Well, in some fanfictions, the characters might swap abilities. For example, Naruto could learn how to use the Turtles' weapons while the Turtles could gain some of Naruto's chakra-based powers. This would lead to a lot of character development as they adapt to these new powers in their respective worlds.
A really cool Teenage Mutant Ninja Turtles fanfiction might be set in a post - apocalyptic future. The turtles are the last hope for humanity against a powerful mutant overlord. They have to use their skills and wits to gather allies and find a way to defeat this ultimate enemy. This type of story could explore their growth and leadership in a dire situation.
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.
One interesting crossover could be where the Ninja Turtles and Spider - Man team up to fight a common enemy like the Shredder and Green Goblin working together. They could combine their unique skills, with the Turtles' martial arts and the web - slinging and super strength of Spider - Man.
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.