Perhaps an OC Lannister who is a talented healer. In a world full of wars and battles in Game of Thrones, a healer Lannister could be an interesting addition. They might have to deal with the moral dilemma of healing both their own family's enemies and allies. They could also have a secret love affair with a member of another house, which would add a layer of drama.
The male OC Baratheon could also be a bastard son who has been living in exile. He returns to Westeros with a group of loyal followers he has gathered over the years. His main goal could be to claim a small piece of land for himself and his men, but he soon realizes he has to navigate the complex web of politics and allegiances in order to survive.
Consider their upbringing. If they were raised away from the main Lannister stronghold, they might have a different set of values. Maybe they were raised by a kind - hearted servant who taught them to be more empathetic. So their personality could be a mix of Lannister pride and this new - found empathy. They could be conflicted between loyalty to their family and doing what is right according to their own conscience.
Another approach is to have the male OC Targaryen be a bastard son. He struggles with his identity throughout the fanfiction. He is initially shunned by both Targaryen loyalists and those who oppose the old regime. However, through his own strength, intelligence, and a bit of luck, he rises in the ranks. He might form an alliance with a powerful house not typically associated with the Targaryens, like the Mormonts. His journey could be about proving himself worthy of the Targaryen name and heritage, all while navigating the complex politics of Westeros.
In a Naruto - Lannister Game of Thrones fanfiction, the story could start with Naruto being transported to the Game of Thrones universe and adopted by the Lannisters. Naruto's sense of justice would immediately clash with the Lannisters' self - serving ways. For example, he would not stand for the way they treat the smallfolk. He might try to use his ninjutsu to improve the lives of the common people, which would draw the ire of other power - hungry nobles. His relationship with the other members of the Lannister family would be complex. He could befriend Tyrion, who also has a sense of justice that is often suppressed. However, characters like Cersei would see him as a threat to her power and try to eliminate him.
One of the main themes is family dynamics. The Lannisters have a complex family structure, and the OC has to find his place within it. Also, the theme of survival is prevalent. In the cut - throat world of Game of Thrones, the OC has to fight to stay alive and relevant. And then there's the theme of reputation, as the Lannister name comes with both advantages and burdens.
Another possibility is an OC who discovers an ancient dragon egg in a long - forgotten cave. He manages to hatch it and forms a unique connection with the dragon. This character could then get caught in the middle of the war between the great houses. He might side with a particular house not for power or glory, but because he believes in their cause, and his dragon becomes a crucial asset in the battles.
If the male OC Lannister was a proud and ambitious type, he would likely interact with Cersei with a mix of respect and rivalry. He'd try to gain her favor while also making sure she didn't see him as a threat. With Tyrion, he might initially look down on him but later come to respect his intelligence. And when it comes to Jon Snow, he could start off as dismissive but as he realizes Jon's leadership skills, he might try to form an alliance.
If Naruto was a Lannister in a Game of Thrones fanfiction, he'd be a very different kind of Lannister. He'd probably use his ninja skills to protect the family in ways they've never seen before. Instead of the usual backstabbing, he might bring in a sense of loyalty and honor that the Lannisters lack. He could use his jutsu to make the Lannister stronghold more secure, like creating barriers with his earth - style jutsu.
One possible plot idea could be a Lannister character traveling to Taiwan - like setting in the Game of Thrones world and having to adapt to a different culture and political landscape there. Maybe they form alliances or face new enemies.
One possible plot could be a young Lannister male OC who, unlike his power - hungry relatives, is more interested in the arts and knowledge. He could secretly befriend a maester and learn about ancient Valyrian lore. This would put him at odds with his family as they see his pursuits as a waste of time. He might then use his knowledge to try and broker peace during the war, facing many challenges along the way.