Another theme is redemption. Sometimes the OC is there to change Madara's path, especially if it's a story set in a time where Madara is on a darker path. Their relationship becomes a means of redemption for Madara. For example, in some fics, the OC's love and understanding make Madara question his more destructive plans. It's a really interesting way to explore his character.
One common theme is power imbalance. Since Madara is a very powerful character, often the OC has to deal with his strength and influence, which creates interesting dynamics in their relationship.
Power is a common theme. Madara is extremely powerful, so often the oc either has to match his power level in some way or is in awe of it. For example, in some fictions, the oc might be a powerful ninja herself and they engage in epic battles together.
One common theme is friendship. Despite their differences, Madara, Hashirama, and the OC often form a unique friendship that transcends the normal boundaries in the Naruto universe. Another theme is power. The OC usually has some sort of power that either attracts or challenges Madara and Hashirama.
Love is a very common theme. The moonlight often sets a romantic mood for the relationship between Madara and the OC.
One common theme is redemption. Often the fem OC tries to redeem Madara from his darker paths. Another theme is love that defies all odds, like clan differences or Madara's past actions. Also, the exploration of power dynamics between them can be a theme, as Madara is a very powerful character.
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.
Often, there's the theme of cultural exchange. The OC could come from a different background or world within the Naruto universe, and their interactions with Madara could involve sharing different beliefs, traditions, or ways of fighting. Friendship is also a big theme. How an OC becomes friends with Madara, what they bond over, like a shared love for nature or a common enemy. And there's also the theme of discovery, where the OC discovers Madara's true nature and he discovers something new about himself through their relationship.
Well, one common theme is the struggle for acceptance. The si oc as Madara reincarnation may face difficulties being accepted by the existing characters in the Naruto world. They might be seen as a threat or an oddity. Another theme is the exploration of new relationships. With a new identity, the oc has to build new friendships or rivalries. And of course, the theme of destiny is also there. Does the oc follow Madara's original path of destruction or try to change it?
One common theme is redemption. Madara, who has a rather dark past, might find redemption through his relationship with Naruko. Another theme could be power balance, as both are quite powerful in their own ways and how they handle that in the relationship.
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 common theme is the struggle against clan differences. Since their clans are often in conflict in the original Naruto lore, in fanfiction this becomes a major obstacle for their relationship. For example, they might have to keep their love a secret to avoid causing more strife between the clans.