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.
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.
His relationship with Hermione would be really different. As a kid, he might be more open about his feelings for her in an innocent, child - like way. He could be constantly following her around, wanting to be involved in whatever she's doing, like when they were younger in the original story but even more so. With Harry, they would probably get into more silly adventures together, like building forts in the Gryffindor common room or trying to catch magical creatures in the castle grounds.
One possible plot could be that Ron gets turned undead in a magical accident. Maybe he was exploring a dark and forbidden part of Hogwarts and stumbled upon an ancient curse. As an undead, he has to deal with his new state while his friends, like Harry and Hermione, struggle to find a way to reverse it. He might have new powers and cravings that are both a mystery and a danger.
Well, perhaps it could be about Ron being cursed by a dark wizard. He then starts to show fiend - like behavior, like craving for chaos and destruction. His friends initially don't recognize what's wrong with him and try to figure out how to reverse the spell.
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, 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.
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.
One possible plot could be Stiles' struggle to adapt to his new female body. He might have to deal with different social expectations and how his friends react to his new appearance. Another plot could involve Stiles trying to find a way to turn back into his male self while facing various challenges along the way.
Well, perhaps there could be a plot where Percy, as a girl, has to form new relationships. She might have a different dynamic with her male friends now that she's a girl. And there could be a story arc about her coming to terms with her new identity. Maybe she discovers new aspects of herself that were hidden when she was a boy. Also, it could be interesting if she uses her new form to her advantage in some situations, like fooling her enemies who are used to dealing with the male Percy.
One interesting plot could be Naruto, as a girl, having to deal with the different expectations of the ninja world towards females. For example, she might face challenges in being taken seriously in combat training at first. Another plot could involve Naruto's friends' reactions. Some might be really confused, while others could quickly accept and support 'her'.