Hermione could be the one. With her vast knowledge of the wizarding laws and her sharp intellect, she might dig up some old regulations that prove Harry's right to his money. She would then fight tooth and nail in the wizarding courts or against the goblins at Gringotts to get his money back.
Maybe he discovers some legal loophole in the wizarding world's financial system that allows him to reclaim his inheritance. For example, if there was some improper handling of his family's vault by the goblins at Gringotts, he could use that as a basis to demand his money back.
Well, if we look at the 'Naruto gets his parents back fanfiction', Naruto's character development might take a different turn. Instead of relying solely on his friends and mentors like Iruka and Kakashi, he'd have his parents' direct guidance. His father, Minato, could train him in advanced ninjutsu. His mother, Kushina, could give him all the motherly love and care he was deprived of. This would likely make Naruto more confident and perhaps a bit more relaxed as he wouldn't have that deep - seated longing for family anymore.
Perhaps in the fanfiction, there's a magical object or a powerful spell that can restore his wings. But to find this object or cast the spell, Lucifer has to face many challenges. He might have to team up with some unexpected allies, like a group of angels who initially didn't trust him but later see his determination to get his wings back and decide to help.
The 'harry gets his mail back fanfiction' could start with Harry noticing that he hasn't received any mail for a while, which is strange in the wizarding world. He starts to suspect foul play. As he investigates, he finds out that there is a new spell that has been cast on the mail delivery system that is misdirecting his mail. With the help of Ron's family's connections in the wizarding world (since they are so well - known in the wizarding community), Harry is able to track down the source of the spell and reverse it, finally getting his mail back.
In 'Jaime gets his hand back fanfiction', there could be a plotline where Jaime has to prove himself worthy of having his hand back. Maybe he has to go on a quest to retrieve a sacred object that has the power to restore lost limbs. Along the way, he meets new allies and enemies. His new - found determination to get his hand back could also inspire those around him. He might start to train a young squire, passing on his skills and wisdom, all while dealing with the physical and mental changes that come with getting his hand back.
Jaime is the main character without a doubt. But other important characters could include the maesters. They might be the ones attempting to use their medical knowledge or ancient lore to figure out how to restore his hand. And Cersei is likely to be in it too. Her reaction to Jaime getting his hand back, whether it's relief, jealousy or something else, will add to the story. And don't forget about Bronn. He might be involved in some of the more dangerous or practical aspects of Jaime's quest to get his hand, like providing protection or finding necessary items.
One possible start for the 'Naruto gets his parents back fanfiction' is that there is a discovery in an ancient scroll. The scroll contains a spell that can bring the dead back under certain conditions. Naruto, being the curious and determined ninja he is, decides to try it out. Or perhaps, in a different dimension, Naruto's parents are still alive and through some strange portal or rift, they are able to return to the Naruto world.
One way could be through a magical encounter. Maybe he stumbles upon an ancient artifact that has the power to restore his abilities. It could be a relic from his home planet that he discovers by chance.
Obviously, Wolverine himself is the central character. But other X - Men members could be involved. Professor X might play a role as he could help Wolverine make sense of his newly recovered memories. He could use his telepathy to guide Wolverine through the maze of his past.