In this fanfiction, it could be that a mad scientist creates a device that emits a ray which affects the Turtles' DNA, causing them to regress into babies. Their personalities remain somewhat the same, but they now have to deal with the limitations of being infants. Their brothers' relationships change as they now have to be more protective. For example, Raphael, who is usually tough, has to be extra gentle with his baby brothers. And they all have to figure out how to get back to their normal forms while still being cute little baby Turtles.
Perhaps a new character could be the main antagonist in this fanfiction. A power - hungry alchemist who discovers the Turtles' mutation and wants to use their baby forms to create an army of mutant slaves. This alchemist would stop at nothing to get his hands on the baby Turtles and experiment on them.
One possible plot could be that a magical spell or some strange phenomenon causes the seven characters to turn into babies. They would then have to rely on others to take care of them. Maybe their friends or allies would be shocked at first but then would have to figure out how to reverse the transformation while dealing with the cute but also very needy baby versions of the seven.
Well, it could be about the Turtles facing a new and powerful enemy that they've never encountered before. Maybe some kind of alien threat that has the ability to disrupt their dimension and force them to team up with alternate versions of themselves from different timelines, like in a 'Meet the Turtles' scenario.
Well, one possible plot could be that Leo discovers an abandoned baby during one of his patrols. He decides to take the baby under his wing and protect it. His brothers are initially skeptical but soon come around. They then have to figure out how to take care of the baby's basic needs like feeding and clothing while also keeping it safe from the various threats in their world.
In the 'tmnt i meets the turtles 3 fanfiction', it could be that a strange time - space anomaly causes the two groups of Turtles to meet. The Turtles from the first TMNT might be shocked by the more advanced technology or different look of the Turtles from the third series. They would need to overcome their initial differences and confusion. The fanfiction could explore how they communicate, share their knowledge of fighting the Foot Clan and other villains, and ultimately create a new bond that helps them save their combined world from a new and dangerous threat.
One possible plot could be that the Teenage Mutant Ninja Turtles somehow end up in the Freddy Fazbear's Pizza place. Maybe they are investigating some strange disappearances that are rumored to be related to the animatronics. They could use their ninja skills to navigate the dark hallways and face off against the haunted animatronics. The turtles' unique personalities would add a fun dynamic, like Mikey being scared at first but then finding the whole situation exciting, while Raph is ready to fight from the start.
It could be any group of seven characters that are well - known in a particular fictional universe. For example, it could be the seven dwarfs from Snow White if it's a fairy - tale - based fanfiction. Or it could be seven superheroes from a comic - book universe.
In this fanfiction, it could be that the Necrofriggian babies are the result of some sort of experiment gone wrong. Ben stumbles upon them and realizes that he is the only one who can help. He has to figure out how to reverse the effects of the experiment while also dealing with the fact that the babies are in a very fragile state. He might enlist the help of his friends, but also face challenges from those who don't want the experiment to be reversed.
Well, perhaps it could be about their families being friends, so they are introduced as babies. Then as they grow up, they have a special bond that's different from others around them.
One possible plot could be that the babies get lost during a big adventure. They end up in an unknown part of their world and have to learn to work together to find their way back home. Along the way, they meet new creatures and have to overcome various challenges, like crossing a big river or getting past a group of unfriendly animals.