Definitely Ginny is a main character in this 'ginny turns into a baby fanfiction'. Harry would also be a central figure. He has a special relationship with Ginny, so he would be highly motivated to get her back to normal. Ron, being Ginny's brother, would also play a big part. He would be concerned about his sister and would be involved in the search for a cure. And Hermione, with her vast knowledge of magic, would be crucial in figuring out how to reverse the spell.
Ginny herself would obviously be a main character, even as a baby. Then Harry, Ron, and Hermione are likely to be main characters as well. They are her friends and would be the ones most likely to try and solve the problem of her being turned into a baby. They would be involved in taking care of her and finding a way to reverse the transformation.
Obviously, Keith himself in his baby form would be a main character. His friends like Lance, Pidge, Hunk, and Shiro would also be main characters as they are the ones who would most likely be taking care of him or trying to find a cure. Maybe Allura and Coran could also be important characters, helping out with their knowledge of Altean technology or magic that might be related to Keith's transformation.
Ron and Hermione could be main characters. They are Harry and Ginny's closest friends. Hermione might offer her vast knowledge of magic to help with any problems the baby has, like if there are some strange magical symptoms. Ron could be there for comical relief, making jokes about how Harry has become a proper family man now.
Kuroko as a baby is the central character. But other characters from the opposing teams could also be important in an unexpected way. Maybe a rival team's player discovers Kuroko's situation and has a change of heart, deciding to help rather than take advantage. And of course, Kuroko's schoolmates who are not on the basketball team might also get involved, adding a different perspective to the story as they are not as familiar with Kuroko's basketball skills but still care about him as a person.
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, Itachi as a baby would be a main character. Sasuke would also be a key character as Itachi's brother. Their relationship would be very different now that Itachi is a baby. Naruto could also be involved, perhaps being curious about this strange transformation and wanting to help out in some way.
Obviously, Harry Potter is one of the main characters. He is a hero in the wizarding world. Ginny Weasley - Potter, his wife, is also a main character. She is from the Weasley family and has her own charm and strength. And of course, their baby James Potter, around whom the story of this fanfiction is likely to revolve. His growth, development, and the events that happen to him will be the focus.
Well, clearly the main characters are baby Harry and baby Ginny. Harry, the famous Boy - Who - Lived, and Ginny, who will grow up to be an important part of Harry's life in the Harry Potter series. As babies, they are the focus, and the fanfic likely explores their early days and any special moments or relationships they might have at that young age.
One possible plot could be that Ginny is hit by a magical spell that turns her into a baby. Her friends then have to figure out how to reverse the spell while taking care of baby Ginny. They might face challenges like finding the right ingredients for an antidote and dealing with Ginny's baby - like needs such as feeding and putting her to sleep.
Obviously, Shadow himself would be a main character even in his baby form. Sonic would also be a key character as he is often the hero in these Sonic - related stories. He would likely be involved in trying to figure out how to turn Shadow back. Tails could be another main character as his intelligence would be useful in finding a solution to Shadow's transformation. He might study the cause of it and try to come up with a remedy.
The main characters are obviously Harry and Ginny, as the story revolves around their baby. Their baby is also a central character, even though it's a new - born or a young child. And of course, there could be other characters from the Harry Potter universe making appearances, like Hermione and Ron. They might be the baby's godparents or just come to visit and offer their help and advice to Harry and Ginny.