A common theme is the transfer of power and knowledge. Madara Sensei is often depicted as having a vast amount of knowledge about ninjutsu and the ninja world in general. So, in many fanfictions, he passes this on to Naruto.
Another theme is redemption. Sometimes Madara Sensei is written as a character seeking redemption through teaching Naruto. He might have made mistakes in the past, but by guiding Naruto, he tries to make up for it. For example, in some stories, he tries to correct the wrongs he did to the Uchiha clan by ensuring Naruto can bring about a more just world for all ninja.
One common theme is growth. Hanabi, as a sensei, helps her students grow not only in their ninja abilities but also as individuals. Another theme could be the passing on of traditions. Since she comes from the Hyuga clan, she might pass on the clan's unique techniques and values to her students.
Friendship is a common theme. Naruto and Gai Sensei have a unique bond that can be explored further in fanfiction. They can support each other, learn from each other, and grow together through their friendship.
One common theme is the mentorship aspect. Ibiki is often shown guiding and teaching his students, passing on his wisdom. Another theme is his role in the ninja world's security, as he's known for his interrogation skills.
One common theme is loyalty. Their loyalty to each other as brothers is often explored, whether it's tested by the events in the ninja world or by their own personal goals. For example, in many fanfics, they have to choose between their loyalty to the clan and their loyalty to each other.
Love and relationships are also common themes. It could be her relationship with other main characters in Naruto. Maybe she has a romantic interest in a character like Naruto or Sasuke, which creates a whole new dynamic in the story. Or it could be about her friendships or rivalries within the ninja world.
One common theme is the power dynamic. Since both Naruto and Madara are very powerful characters, exploring how their powers play into their relationship is often a key aspect. For example, in some fanfictions, their powers are what initially attract them to each other.
The theme of redemption can also be present. Madara was considered a villain, but Naruto might see some good in his initial intentions. So, Naruto could try to redeem Madara's name or ideals in a way. He could take the positive aspects of Madara's vision for the ninja world, like unity among the clans, and work towards achieving it in a more peaceful and inclusive manner.
Power. Most fanfictions focus on the extreme power of Madara's Rinnegan. They explore how it can be used to dominate battles or change the Naruto world. Another common theme is mystery. Since the Rinnegan has many unexplored aspects in the original series, fanfictions often try to uncover its secrets.
There are several common themes. For example, power dynamics play a role. Naruto is a powerful ninja, but so was Madara. In a love story, how they balance their powers and respect each other's strength can be a theme. Also, there's often the theme of acceptance. Naruto accepting the female Madara for who she is, including her past mistakes and her complex personality. And of course, there's the overarching theme of love conquering all, which is a classic in fanfiction, where their love overcomes any obstacles like the hatred that Madara might have carried in the original story.
Many fanfictions also touch on the theme of the afterlife. Since Edo Tensei is a form of resurrection, questions about what it means for Madara to be brought back, and how it relates to the afterlife in the Naruto universe are often explored. There could be stories that delve into his relationship with the person who resurrected him and what their end goals are in relation to his Edo Tensei state.