There could also be new characters introduced specifically for this fanfiction. Maybe there is an enemy who is after the reborn baby because of its special powers or significance. This enemy would then be a main character as they drive the conflict in the story. Tsuna would then have to protect the baby from this threat, with the help of his friends and family, making for an exciting and action - packed fanfiction.
Another possible main character could be Tsuna's family members. For instance, his mother could be involved as she might be taking care of the reborn baby along with Tsuna. Or his tutor Reborn in his normal form (not as the baby) could also be a main character, guiding Tsuna on how to handle the baby and what it all means in the grand scheme of things. The baby might hold some key to Tsuna's future development as a strong leader, and Reborn would be there to ensure Tsuna makes the right choices regarding the baby.
Well, it could be about the reborn baby having some sort of special connection with Tsuna. Maybe the baby has unique powers that help Tsuna in his adventures or in dealing with his daily challenges. For example, the baby might be able to sense danger approaching Tsuna and alert him in some way.
The main characters are Tsuna and Giotto. Tsuna is often portrayed as a character with great potential that he gradually discovers and develops throughout the story. Giotto, on the other hand, is usually a strong and influential figure with his own set of skills and charisma.
It could be that the baby is an alien baby who crash - lands on a planet where the beast is the dominant species. The beast might be a huge, furry mammal - like creature.
The main characters would obviously be the five Avengers. It could be Iron Man, Captain America, Thor, Black Widow, and Hulk. And of course, the baby would be a central character as well. Maybe the story could focus on how each of the Avengers interacts with the baby differently. For example, Iron Man might use his technology to create baby - friendly gadgets, while Thor might tell the baby stories of Asgard.
Well, Tsuna is at the heart of it all. He is the one around whom the story usually revolves. And then there are the arcobaleno. They are a group of powerful and mysterious characters. Their interactions with Tsuna are what drive a lot of the plot. For example, some arcobaleno might be more antagonistic at first, testing Tsuna's limits, while others are more supportive right from the start, and all these different relationships contribute to the overall dynamic of the fanfiction.
The main characters are Tsuna and Fon. Tsuna is often portrayed as a character with great potential that is gradually being unlocked, while Fon is a more experienced and wise figure.
There could be an ancient evil force that has been awakened. This force is interested in the power of the Vongola Rings and wants to use it for its own dark purposes. Tsuna and adult Reborn would need to combine their strengths, with Tsuna's determination and Reborn's combat and strategic expertise, to defeat this powerful and mysterious antagonist.
Obviously, Ash would be a main character even in his baby form. Pikachu is bound to be a key character as well, being Ash's closest Pokémon partner. His other Pokémon like Bulbasaur, Charmander, and Squirtle could also play important roles in protecting and taking care of baby Ash.
Obviously, Nightwing himself, even as a baby, would be a main character. His friends in the Bat - family like Batman, Robin, and Oracle would also be main characters. They would be the ones dealing with the situation of baby Nightwing.
Edward, of course, would be one of the main characters. And there could be a female character, like Isabella, who might be Edward's love interest and the potential mother of his baby. Maybe there's also Edward's best friend, Jacob, who gives him advice on this journey of wanting a baby.