Since it's a fanfic, it might still have Naruto as one of the main characters, just with hedgehog - like features. There could also be other characters from the original Naruto series like Sasuke and Sakura, who would interact with this new - look Naruto.
Since I don't know the exact 'christmas hedgehog story', but most likely the main character would be the hedgehog itself. There might also be other animals like birds or squirrels that are its friends or neighbors in the forest.
Knuckles would be a great addition. His strength and his role as the guardian of the Master Emerald can add a lot of depth to the story. He could have some interesting interactions with Coldsteel, perhaps even getting into a friendly rivalry. Also, Shadow could be included. His dark and brooding nature would make for an interesting dynamic with Coldsteel.
The main character is, of course, Shadow the Hedgehog himself. He is the central figure in this dark story. And then there's Dr. Eggman. He often plays a role in Shadow's story, either as an antagonist trying to use Shadow for his evil schemes or as someone who is involved in the events that led to Shadow's creation. There are also other characters like Sonic and his friends who sometimes cross paths with Shadow in this story, and their interactions add more depth to Shadow's dark journey.
The main characters are the fox and the hedgehog.
Sonic is of course the main character. He's a blue hedgehog with super - speed, always ready to take on Dr. Eggman and save the day.
As I don't know the exact 'hedgehog children's story', but likely the main character would be the hedgehog itself. Maybe there could also be other animals like a friendly rabbit or a curious mouse that interact with the hedgehog.
Obviously, Shadow the Hedgehog is a main character. He's the one with the vampire - like qualities. Sonic could also be a main character in some fanfictions. He might be in conflict with Shadow because of his new vampire nature or could be trying to help him control it. Amy could be another main character, perhaps she has a special connection to Shadow and tries to understand his transformation.
Sonic the Hedgehog is the star of the show. He's the one we follow on his adventures. Tails, his two - tailed fox friend, is always by his side, helping out with his technological skills. Dr. Eggman, that evil genius, is there to cause trouble. Additionally, characters like Amy Rose might make an appearance. Amy has a crush on Sonic and her determination and her hammer - wielding skills could add an interesting dynamic to the story in the light novel.
Obviously, Naruto is the main character. He is the one who becomes this 'god - like' figure in the fanfic. But there are also other important characters like Sasuke. Sasuke might play a role in either supporting Naruto's new power or being in conflict with him because of it.
Typically, it's fans of the Sonic the Hedgehog series that create 'amy the hedgehog fanfic'. These could be amateur writers who want to explore the character of Amy further. They might be inspired by the official Sonic games, comics, or animated shows. Some might be part of fan communities where they share their love for the character and their ideas through writing fanfics.