One common theme is the idea of forbidden love. Since Madara and Hashirama are from rival clans, their relationship goes against the norms of their society. Another theme is the power of love to change destinies. Their love could potentially change the fate of the ninja world. For example, it could prevent future wars between the clans.
Reconciliation is also a theme. Given the historical enmity between their clans, a lot of fanfics focus on how fem Madara and Hashirama work towards reconciling their clans through their relationship. They become a symbol of hope for a united future, and this theme adds a lot of depth to the stories.
Often, the theme of redemption is present. Fem Madara may be depicted as having a change of heart or being redeemed through her relationship with Hashirama. Additionally, the theme of sacrifice is common. They might sacrifice their own beliefs or desires for the sake of their relationship or for the greater good. The theme of loyalty also pops up a lot, as they are loyal to each other in different ways, which is interesting to explore in these fanfictions.
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.
The theme of unrequited love is also quite popular. It's often depicted that one of them has feelings that the other is initially unaware of. And there's the theme of power balance. How their powers affect their relationship, whether it brings them closer or drives them apart.
One common theme is the complex relationship between them. Given their history in the Naruto series, fanfics often explore how their past rivalries and loyalties translate into a romantic context in a yaoi relationship.
One key theme is friendship. Despite their clans' differences, fem Madara and fem Hashirama can form a strong bond of friendship. Another theme is breaking gender stereotypes. In the Naruto world, they are powerful female characters who don't conform to the traditional roles. Also, the theme of unity is important. Their relationship can symbolize the unity that could have been between the Uchiha and Senju clans.
One great 'madara x fem hashirama fanfic' could be 'The Bond Beyond the Clans'. It delves into a world where Madara and a female Hashirama form an unexpected bond early on. Their relationship is explored in the context of the turbulent times of the ninja clans. Another one might be 'A Different Path' which shows how their relationship could have changed the course of the entire ninja world's history. It has some really interesting character interactions.
One common theme is their friendship. Despite being on opposite sides at times, many fanfictions explore the deep - seated bond they had. Another theme is redemption. Madara, especially, is often the subject of redemption arcs in fanfiction. Also, the theme of sacrifice for the greater good is seen, as both characters in the original story were willing to make sacrifices for their respective villages.
One common theme is the exploration of their unspoken feelings. In the original story, there are a lot of unaddressed emotions between them. Fanfiction writers often take this opportunity to delve into those feelings. Another theme could be the power dynamic. Hashirama and Madara are both very powerful, and in lemon fanfiction, this power dynamic can be played with in different ways, like one protecting the other in a more intimate way.
Love and understanding are also quite common themes. In many of these fanfictions, they learn to understand each other's perspectives better. For example, in some stories, they start off as rivals but gradually come to love and respect each other. It's a journey of emotional growth for both of them. Also, the theme of changing the ninja world for the better is often there, as they use their combined influence to make positive changes.