Most likely, the main characters would be the Teenage Mutant Ninja Turtles themselves - Leonardo, Donatello, Michelangelo, and Raphael. They are the core of any TMNT story.
In the 'tmnt behind the darkness fanfiction', the main characters are surely the four turtles. However, there could also be other important characters. For example, their mentor Splinter might play a crucial role in guiding them through the challenges they face in the dark. And perhaps there could be a new character, a mysterious figure that is either an ally or an enemy, who has some connection to the darkness that the turtles are exploring.
The Teenage Mutant Ninja Turtles are the mainstay of the 'tmnt behind the darkness fanfiction'. But don't forget, there could be antagonists too. There might be a powerful dark entity as the main villain, whose actions drive the plot and force the turtles to venture into the darkness. Also, April O'Neil or Casey Jones could potentially be involved, bringing their own skills and relationships with the turtles into the story.
I'm not sure specifically as it could cover a wide range of ideas. It might be about the Teenage Mutant Ninja Turtles facing some sort of dark forces or situations that are not shown in the original series. Maybe it involves them exploring a part of their world that is filled with mystery and evil.
Well, of course, the Teenage Mutant Ninja Turtles are likely to be main characters. They are usually Leonardo, Donatello, Michelangelo, and Raphael. And then there's the OC (Original Character) who is in the jungle setting. The OC could be a human, another mutant, or some other kind of being.
Some fanfictions might introduce new characters as friends or allies of the little sister. For example, there could be a street - smart kid who helps the little sister understand the human world better since she's growing up in a rather unusual family. But the main focus always remains on the relationship between the turtles and their little sister.
The main character is obviously the lone rat. He is likely a key figure in the story, guiding and protecting the cubs.
Splinter is also likely to be a main character. He is the turtles' master and mentor, and his wisdom often guides them in difficult situations. In this fanfiction, he might play a crucial role in helping the turtles face new challenges.
While Mikey and Donnie are the main focus, sometimes their older brothers Leo and Raph can also play important roles in the fanfiction. For example, they might be searching for the missing baby turtles, or they could be the ones who teach Mikey and Donnie important lessons when they finally reunite.
Obviously, the four main Turtles - Leonardo, Donatello, Raphael, and Michelangelo are going to be main characters. They are the core of any TMNT story. They'll probably be the ones interacting with the other versions of themselves in this 'Meet the Turtles' concept.
I'm not sure specifically as it depends on the fanfiction itself. But it could be an original character created by the author who has a special ability to perceive the darkness. Maybe it's a hero - type figure who is determined to fight against whatever the darkness represents.
In some cases, it might focus on the side characters from the original work. The author might have seen potential in these characters to be the main focus in a darker story. So, it could be the less - known characters that get a chance to shine and show their true nature in this 'ultimate darkness' fanfiction.
The main characters are Darkness and Lily. Darkness could be a complex character, maybe having some hidden motives or a tragic past that makes it act in certain ways. Lily, on the other hand, might be the one who tries to understand Darkness and bring out the good in it. She could be kind - hearted and have a strong sense of justice.