Another theme might be acceptance. He may face challenges in getting his old friends to accept his new badboy self, or vice versa. And also, self - acceptance as he tries to figure out if he really likes this new version of himself.
One possible theme could be identity transformation. Edward is changing from one type of person to another, which can explore how a person's self - concept can shift.
Well, it might be a fanfiction where the character Edward used to be a geek. Maybe he was into all things nerdy like comics or video games. Then, for some reason, he transformed into a badboy. This could involve a change in his appearance, like dressing in a more edgy style. It could also mean a change in his behavior, perhaps becoming more rebellious or confident.
One common theme is self - discovery. As Edward changes from a geek to a bad boy, he is likely exploring a new side of himself. Another theme could be acceptance, both from himself and from those around him. His old friends might have a hard time accepting the new him, and he may struggle with accepting his new identity as well.
Edward, being a former geek fanfiction, could be a person who was involved in writing or consuming fanfiction within the geek culture. It might be that he has since moved on from this hobby. Without more context, it's difficult to say more. He could have been part of a specific fandom, like a science - fiction or fantasy one, where he used to create or enjoy fictional stories based on existing works.
One popular fanfiction might be 'Edward's Transformation' which delves into how he goes from being a geek to a bad boy. It could show his journey in changing his appearance, attitude, and social circle. Another could be 'The New Edward' where the author explores his new bad - boy persona and how it affects his relationships with old friends and new acquaintances.
Maybe Edward was a big fan of certain geeky shows or movies and used to write fanfiction about them. But now he has given it up for some reason.
Maybe the reason he was turned into a kid is related to a long - forgotten alchemy experiment. And as he's a kid, he unknowingly starts to repeat the steps that led to his transformation in the first place, which could lead to some really unexpected consequences. This would make the plot more complex and engaging.
The theme of discovery might also be present. Edward's tail could be something new and mysterious, and through the story, he could be on a journey to discover the true nature and potential of his tail. This could involve exploring his own history, or the history of his kind if there are others like him in the fanfiction.
One possible theme could be friendship. Since Edward is a rather unique and isolated character, a story could explore how he and Jimmy form an unlikely friendship. Another theme might be acceptance. Jimmy could be the one to help the community accept Edward for who he is.
A possible theme could be family. If Edward is in diapers, his family would have to take care of him. This could explore the family dynamics in a different way. For example, how Esme would mother him in this state, or how Emmett would tease him but also protect him. Also, the theme of adaptation could be there. Edward would have to adapt to this new form and the limitations it brings, like not being able to move as freely as he used to.
Often, the theme of rebellion is present. Natsu as a bad boy in these fanfictions might be rebelling against the strict school system in Fairy Tail. There could also be themes related to friendship. His friends might try to bring back the old Natsu or accept this new 'bad boy' side of him. And of course, there may be themes of self - discovery as he navigates this new identity in the school setting.