Alternate universe is also a common theme. This could be an AU where Itachi never joined the Akatsuki, or where Naruto and Itachi meet under completely different circumstances. These types of fanfictions allow for a lot of creativity as the writers can completely change the events and relationships in the Naruto world.
The theme of power and its consequences is also quite common. Sasuke, Naruto and Itachi all possess great power. Fanfictions might explore how they handle this power, whether they use it for good or are tempted to use it for their own purposes. For instance, Sasuke's pursuit of power for revenge in the original story can be re - examined in fanfictions. Also, family bonds are a significant theme. Itachi's actions were deeply related to his family, and fanfictions may delve deeper into how his relationship with Sasuke affects the overall story and how Naruto might interact with this family dynamic.
The complex relationship between Itachi and Sasuke. Itachi had to make difficult choices for the sake of the village and his brother. Fanfictions allow readers to explore different scenarios where things could have been different, like if Itachi could have found a way to be honest with Sasuke from the start.
Another popular theme is growth. All three characters have grown throughout the Naruto series. In fanfictions, their further growth, both in terms of power and as individuals, is often depicted. For example, Gaara becoming a more confident leader, Naruto achieving new levels of power, and Hinata becoming more assertive.
One common theme is redemption. Itachi has done many controversial things in the Naruto series, and in these fanfictions, his want for Naruto could be part of his journey towards redemption. He might see something in Naruto that makes him strive to atone for his past sins.
They're popular because the relationship between Naruto and Itachi is so complex and full of potential. Itachi is a very mysterious character, and Naruto is the protagonist with a big heart. When you put them together in the context of the Akatsuki, it creates a lot of interesting scenarios for fanfiction writers to explore.
One popular theme is the power dynamic. Since the Kyuubi is a very powerful being, how the female Kyuubi's power affects Naruto and Hinata's relationship is often explored. For example, she might use her power to protect Hinata from danger, which in turn makes Naruto respect her more. Another theme is the friendship aspect. The female Kyuubi becoming friends with Hinata and Naruto, and how they interact on a daily basis is a common theme. They might go on missions together or just have fun training sessions.
One of the most popular themes is the exploration of their complex relationship. Fans often write about how they could have reconciled in an alternate universe. Another theme is power - how their combined powers could be used against a common enemy. And family loyalty is also a big one, delving into how their family ties influenced their actions and how that could be different in a fan - made scenario.
One popular theme is redemption. Many fanfics explore how Itachi, with his complex past of killing his own clan, can find redemption through his relationship with Madara. It gives a new perspective on his character.
Another type of fanfiction could be set in an alternate universe where Itachi never had to kill his clan. In this story, he and Naruto could become friends much earlier. Itachi could act as a mentor to Naruto, guiding him not just in ninja skills but also in understanding the complex politics and history of the ninja world. This would change Naruto's perspective and his relationships with other characters in the series.
Transformation themes are also common. The 'big cock overlord' character might bring about unexpected changes in the Naruto universe. Maybe some characters transform in terms of their abilities or even their personalities to adapt to this new threat or presence. It could be that a character who was once meek now has to become stronger in the face of this powerful overlord, and this transformation journey is an interesting theme to explore in such fanfictions.