Well, one possible plot could be that Harry discovers his true heritage as Lucifer's brother. This could lead to a conflict within him as he tries to reconcile his life as a wizard with this new, dark family connection. Maybe he has to face some sort of magical or otherworldly council that is worried about the implications of having Lucifer's brother in the wizarding world.
I'm not sure specifically which 'harry is lucifer's brother fanfiction' is highly recommended. You could try searching on popular fanfiction websites like Archive of Our Own or Fanfiction.net. They have a vast collection of fanfictions, and you might be able to find something related there.
Yes, there could potentially be such a fanfiction out there. In the world of fanfiction, creators often come up with wild and imaginative crossovers. Naruto has a complex backstory and set of powers in his own universe, and Lucifer has his own significance in the DxD world. Combining them as brothers could lead to some really unique storylines, like Naruto bringing his ninja skills and values into the DxD world while having to deal with being related to Lucifer.
The 'harry is lucifer's mate fanfiction' could be a really wild and creative story. It might start with an unexpected encounter between Harry and Lucifer. Since Harry is often associated with the world of magic and good, and Lucifer with evil, their pairing as mates would create a huge contrast. It could explore how they overcome their differences, or if they don't, how that leads to chaos. There could be a whole new world - building aspect where the rules of both Harry's world and Lucifer's realm are blended together, and new characters are introduced that are a result of this unique relationship.
There could be. Fanfiction writers have a great deal of creative freedom, and they sometimes come up with really out - there ideas. But it's important to note that in the official Harry Potter series, Harry Potter is the son of James and Lily Potter. This kind of fanfiction is likely to be a very different and perhaps controversial take on the story.
Yes, there might be such fanfictions out there. Fanfiction is a vast world where all kinds of creative and often out - of - the - box ideas are explored. However, this particular concept is quite unorthodox as Harry is typically associated with the Harry Potter series and Lucifer has his own set of lore in different mythologies. But with the freedom of fanfiction, authors can create crossovers and reimagine characters in new and unexpected ways.
Well, in fanfiction, anything can happen. Just because it says Harry is Uryu's brother doesn't necessarily mean it's going to be a traditional brother relationship. It could be a metaphorical brotherhood, or it could be a result of some crazy plot device like a cross - over between two different universes. So, it really varies from one fanfiction to another.
Obviously, Harry is one of the main characters as he is the vessel. And Lucifer, of course, is a key figure as his essence is involved with Harry. There might also be other characters from the original Harry Potter universe, like Hermione and Ron, who could be trying to deal with the situation of Harry being Lucifer's vessel.
Power struggles are also quite common. Lucifer and his brother often have different levels of power, and in the oc (original character) fanfictions, the oc might get involved in these power dynamics, either trying to balance them or being affected by them. For example, the oc could be a mediator between the two brothers in a power struggle. And sometimes, there are themes of redemption, where either Lucifer or his brother is on a journey to redeem themselves, and the oc plays a role in that journey.
Perhaps in this fanfiction, Naruto's connection to Lucifer is a secret kept by a few powerful beings. As he grows stronger, he starts to show signs of Lucifer - like abilities such as the ability to manipulate shadows in a more sinister way. This causes his friends to be both curious and a bit afraid of him. Naruto then has to figure out how to control these new powers and keep his relationships intact.