Well, in such a fanfiction, Sonic might lose his usual speed and confidence at first. He'd probably be more naive and rely on his friends more. Maybe he'd have to learn basic things all over again, like how to properly control his powers in his new, smaller form.
It could also be a new villain. Maybe someone who has been waiting for Sonic to be in a vulnerable state. This new villain could have a special power or weapon that is more effective against Sonic as a kid. For example, a device that can slow down Sonic even more or nullify his powers temporarily. They might target Sonic not just because of his weakened state, but also because they know that his friends will be distracted trying to help him get back to normal.
If Deadpool is turned into a kid in fanfiction, it would be a total shift in his character dynamic. His relationship with other characters would change drastically. For example, his friends might have to take on a more parental role. And his enemies might not take him as seriously at first, but he could still surprise them with his child - like cunning. Also, his origin story would be interesting to re - imagine from a kid's perspective, how he discovers his powers and all that.
Well, he might lose all his evil cunning at first. Since he's a kid, he could start to see the world in a more innocent way. Maybe he'll make friends with people he used to terrorize, not realizing who they are. And he could be easily influenced by good-hearted characters, starting to develop a sense of right and wrong that's completely different from his adult, villainous self.
Scott would probably be very protective. He'd feel responsible for taking care of Stiles and making sure he doesn't get into too much trouble. Lydia might be initially shocked but then use her intelligence to try and figure out how to reverse the situation. And Derek, well, he'd probably be a bit annoyed at first but would also end up being one of Stiles' protectors.
In some fanfictions, a possible plot could be that Stiles, as a kid, has a different perspective on the supernatural world around him. He might not be as afraid as he was when he was older. For example, he could befriend a supernatural creature that the older Stiles would have been more cautious about. This new friendship could lead to new alliances for the pack. Also, his family's reaction to his sudden transformation could be explored. His dad might be really confused and worried, while his friends are trying to keep it a secret from the wrong people in town.
Often, there's a plot where Ron, as a kid, has to deal with bullies. Since he's smaller and less experienced, it makes the situation more challenging. He might then learn some valuable lessons about standing up for himself. Also, there could be a plot where he discovers a hidden talent that he didn't know he had as an adult, like being an amazing artist or a natural at flying on a broomstick even at a young age.
The other villains in Gotham. The power dynamic changes when the Joker is a kid. They might see this as an opportunity to take over his territory or try to use the situation to their advantage. But they also might be worried that if the Joker turns back to normal, he'll come after them for taking advantage of his weakened state.
Well, in the original Sonic, he was confident in his abilities in a very male - oriented way. When turned into a girl, she may face self - doubt in a different way. She might question if she can still be as effective as a hero. Her interactions with male characters would also be different. They might be more protective of her at first, which she would have to navigate. Her development would also involve learning how to use her new form to her advantage. Maybe she discovers new ways to use her speed that are more in tune with her female form, like being more agile in different situations.
One popular plot twist could be Sonic, as a girl, having to deal with different social dynamics in the Sonic universe. For example, she might face new types of relationships with other characters like Tails or Knuckles. Another could be that her new form gives her different abilities or limitations that she has to overcome. Maybe she has a harder time running as fast as she used to because her new body is not as accustomed to it. And finally, a plot twist could be that she has to hide her identity from her enemies who are now confused by this new female version of Sonic.