Maybe Orochimaru. Despite being a villain in the past, he is a master of forbidden jutsus and experiments. He could see Naruto as an interesting subject and give him a new arm with some dark powers, which Naruto would then have to learn to control for the greater good.
There might be such fanfics in the vast world of fanfiction, but it goes against the original canon of the 'Fullmetal Alchemist' series as male pregnancy is not a part of the normal story. However, some fanfic authors like to explore very unconventional and out - of - the - box ideas.
Maybe he was protecting someone in Wave. He's always the self - sacrificing type, so he could have put himself in harm's way to save a villager or a friend.
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, perhaps the new arm comes from some kind of ancient and mysterious source. It could be an arm that was once part of a powerful ninja from the past. This new arm could have a mind of its own, at first causing Naruto some trouble as he tries to control it, but eventually they work in harmony and it gives Naruto an edge in battles against tough enemies.
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.
Maybe he starts to train with one - armed techniques. He could learn from other one - armed ninjas if there are any in the fanfiction world. His friends would also play a big role. They might encourage him to keep going or help him in his training.