Love and loyalty are also common themes. Despite the harem setup, the fanfictions usually explore how the characters develop deep feelings of love and loyalty towards Madara and among themselves. Also, self - discovery is a theme. As Madara interacts with different characters from various worlds, he often discovers new aspects of himself, and the same goes for the other harem members. For example, a character might learn about their own strength or their capacity for love through their experiences in the harem. It makes for a rich exploration of the characters' personalities.
One common theme is power dynamics. Madara is a very powerful character, so in the harem, there are often issues of how his power affects his relationships with the other members. Another theme is cultural clash. Since it's a crossover, characters from different backgrounds come together, which can lead to interesting cultural exchanges within the harem.
A major theme is the idea of redemption or change. Madara, with his complex past in the original Naruto series, often has a chance to change or find redemption in these fanfictions. The harem members can play a role in this process. Also, the theme of adventure is present as they are often in situations where they have to face challenges together, be it from other powerful characters or from the different worlds they are in. This not only tests their relationships but also their individual and collective strength.
Love and relationships are another set of common themes. Fanfiction writers often explore how female Madara's relationships, whether it's with her clan members, friends, or rivals, are different from the male version. Her romantic relationships, if any, are also explored in a new context, like her potential relationship with Hashirama taking on a different dynamic due to her being female.
There's 'Madara's Harem Adventure'. In this fanfiction, Madara embarks on a journey through different realms and gradually forms a harem along the way. The author does a great job of portraying Madara's character and how he deals with the multiple relationships in the harem. It also has some exciting action scenes interspersed with the relationship - building parts. Well, another good one is 'Madara's Crossover Harem: New Beginnings' where Madara's character is explored in a new light as he enters into a harem situation that includes characters from other series.
One common theme is the power dynamic. Madara is a very powerful character, so exploring how the reader interacts with that power is often seen. Another is redemption. The reader might be a character who tries to bring out the good in Madara. Also, love across different worlds or time periods can be a theme, especially if the fanfiction has an AU setting.
One of the main themes is revenge. In many fanfictions, Madara's actions are driven by a desire for revenge against those who have wronged the Uchiha clan. Also, the theme of family honor comes up. Madara is often portrayed as trying to uphold the honor of the Uchiha name during the chaos of the warring clans.
A common theme is power. Often, the OC has some special power or ability that either rivals Madara's or complements it. This creates an interesting dynamic between them.
Love and attraction are very common themes. The idea of the reader being drawn to Madara's strength and mystery. Also, the theme of trust. Given Madara's complex nature, the fanfictions often deal with the reader building trust with him. Additionally, there's the theme of adventure. The reader and Madara might go on adventures together in the Naruto - like world, facing various challenges and enemies.
Often, Naruto might be paired with Madara in some sense. Their opposing views on power and peace could create interesting interactions in the fanfiction.
One common theme is power. Since Madara was extremely powerful, fanfictions often explore how Naruto deals with this new - found power if he is related to Madara. Another theme is identity. Naruto has to figure out who he is now that he has this connection to Madara Uchiha.
Romance is also a popular theme. Writers might pair female Madara with other characters from the Naruto universe, like Hashirama. The relationship between them could be explored in a new light, with the gender - swap adding a different dynamic to their interactions.
One great 'Naruto Madara Uchiha Crossover Fanfiction' is 'The Uchiha's New Path' on FanFiction.net. It combines Madara's power with an alternate universe concept where he teams up with characters from other anime. It's really interesting to see how his skills and personality interact with new characters.