Well, it could be about Naruto having some sort of connection to Lucifer. Maybe he inherits some of Lucifer's powers and has to deal with the consequences. For example, he might struggle with the dark nature of those powers while still trying to protect his village.
Perhaps it's a group of ninja who see Naruto's newfound Lucifer - related power as a threat to the ninja world order. They might form a secret organization to oppose him. They could be from different villages and set aside their differences just to stop Naruto. They might believe that his power will bring chaos and destruction to the world of ninjas.
Power and its consequences are a common theme. The oc heir of lucifer often has to deal with the great power they inherit. Another theme is identity. They might struggle with being the heir of lucifer while also having their own sense of self.
One popular 'oc heir of lucifer fanfiction' might be found on platforms like Archive of Our Own. You can search for tags related to 'oc' (original character) and 'heir of lucifer' to discover relevant stories. Some fictions might explore the character's journey in the world of Lucifer, their powers, and the conflicts they face.
One of the common themes is temptation. Given his heritage, he is likely to face numerous temptations, whether it's power, wealth, or influence. He has to resist these in order to grow as a character. Also, there's often the theme of destiny. Is he doomed to follow in Lucifer's footsteps, or can he carve out his own path? This internal conflict about his future is a recurring theme. And then there's the theme of relationships. How does he interact with other characters, especially those who are wary of his lineage?
To develop his character, start with his goals. Does he want to take over Lucifer's domain, or does he want to create his own? Then, focus on his relationships. His interactions with other characters, whether they be angels, demons, or humans, can shape his character. Also, consider his weaknesses. Maybe he has a fear of being rejected because of his heritage. And don't forget about his powers. How does he learn to control them? How do they affect his view of himself and the world around him?
It could be a long - lost relative of Hashirama. Maybe a distant cousin or a descendant from a hidden branch of the Senju family. This character would carry the bloodline of Hashirama and thus have the potential to inherit his powers.
Power and its consequences are also a big theme. Naruto has his own set of powers in his universe, and when combined with Lucifer - who is often depicted as extremely powerful - it explores how these powers can be used, misused, or how they change the characters. This can lead to themes of corruption or self - discovery through power.
A fanfiction idea could be that Lucifer from the Highschool DxD universe somehow ends up in the Naruto world. In the Naruto world, he could be seen as a powerful and mysterious figure. He might interact with the ninja clans and shinobi, and his powers could be both feared and respected. He could also have some kind of connection with the tailed beasts or the Sage of Six Paths. The story could revolve around how his presence disrupts or changes the balance of power in the Naruto world.
One possible scenario in this fanfiction could be that Naruto uses his ninja training techniques to help Fem Lucifer develop new skills. Maybe he teaches her stealth, which she can then use in her own realm to gather information more effectively.