Another possible main character could be a wise old mentor figure. This person might have knowledge about these strange transformations. They could guide Nico's friends or family in their quest to turn Nico back. Maybe this mentor has been around for a long time and has seen similar magic used in the past, so they know where to start looking for answers.
Well, one possibility could be that a magical spell goes wrong in the world of the fanfiction. Maybe a young wizard was trying to do a simple transformation spell near Nico and it backfired, turning Nico into a baby. Then, his friends have to figure out how to reverse the spell. They might start by looking for ancient books in a hidden library that could hold the key to the solution.
In addition to the usual suspects, there could be some new characters introduced. For example, an old Pokémon trainer who has seen similar things before and can offer some advice on how to deal with baby Ash. Or a mysterious Pokémon that has the power to either help or hinder the process of getting Ash back to normal.
Well, one possible plot could be that the other characters in the Solangelo universe are super confused at first. Percy might be all like 'Whoa, a baby Nico?'. They'd have to figure out how to take care of him. Maybe Will is the most determined to find a way to turn him back and in the process, there are some really cute and funny moments like baby Nico trying to grab Will's stethoscope and put it in his mouth.
The Akatsuki might be the main antagonists. They might think that a baby Sasuke is easier to capture and they could use him for their own purposes, like extracting his Sharingan or something else related to his power. They would be a great threat as they are powerful and cunning.
Definitely Percy. He's always getting into wacky situations himself, and having a baby Nico around would just add to the chaos. He might try to teach baby Nico how to sword - fight with a toy sword, and it would be this really goofy scene with Percy making big, exaggerated moves and baby Nico just giggling.
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.
Sakura could be a main character. She might be the one who takes on a motherly role towards baby Naruto. She'd be very protective and try to teach him basic things. Kakashi could also be important. He'd use his wisdom to figure out how to deal with this situation and also keep an eye on Naruto's safety.
It could be an old rival of the Malfoy family. Maybe a wizard whose family was wronged by the Malfoys in the past. This wizard has been biding his time, waiting for the perfect opportunity to strike. Turning Draco into a baby is his way of getting revenge on the family, making them look weak and powerless.
Perhaps an old enemy of Harry's family resurfaces. This villain might have a long - standing grudge against the Potters and sees turning Harry into a baby as a form of ultimate revenge. They could be using a spell that has been passed down through generations in their family, a spell that was created specifically to harm the Potters.
Definitely Aunt May. She would be super worried about baby Peter and would do everything she could to take care of him. She might even call in some old friends or neighbors to help out.