One common theme is the power - up of the characters. Since Naruto characters have their own unique powers and High School DxD has its own system, when combined in fanfiction with a character like Millet, there's often a focus on how they gain new abilities or enhance their existing ones.
Another theme is the exploration of different universes. Writers often like to have the characters from Naruto and High School DxD interact in ways that are not possible in their original stories. Millet can be used as a catalyst for these interactions, and this exploration of new settings and rules is a common theme. There's also the theme of friendship and rivalry. The characters from both series can form new friendships or rivalries, which can be interesting to read about.
Yes, there are quite a few. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto DxD Millet' and you'll find a variety of stories with different themes and plotlines.
One common theme is power - up. Characters from both Naruto and DxD often gain new powers or abilities when combined in fanfiction. Another theme is the exploration of different cultures. Since Naruto has its ninja culture and DxD has its own demon and angel - related cultures, fanfictions often explore how these cultures interact.
Another theme is the clash of cultures. Naruto comes from a ninja - based culture, and DxD has a very different supernatural culture. Fanfictions often explore how Naruto reacts to the different social norms, values, and power structures in DxD. It can be really interesting to see how he tries to find his place in this new world.
Power-ups are a common theme. Since Naruto already has his ninja powers and then enters the DxD world with its own set of powers like Sacred Gears, a lot of fanfics focus on how he combines or enhances these powers. For example, he might learn to use his chakra in new ways because of the DxD environment.
Power - up is a common theme. Naruto often gets new powers or enhances his existing ones as a demigod in the DxD world. Another theme is the clash of cultures, as Naruto's ninja culture meets the supernatural elements of DxD.
One common theme is power - up. Naruto, already a powerful ninja, often gets new abilities or enhances his existing ones in the DxD world. Yasaka too might gain new powers or develop her skills further. Another theme is friendship. They form bonds with DxD characters and together face challenges.
One common theme is power adaptation. Naruto has to adapt his ninja powers in the DxD world which has its own set of rules. Amaterasu, being a powerful ability, often becomes a focus in terms of how it can be used or controlled in this new world.
One common theme is power - up. Since Naruto is already a powerful character in his own right, and the DxD world has its own power system, often in these fanfictions Naruto gets new powers or finds ways to combine his existing powers with DxD elements. For example, his chakra could be combined with the magic in DxD.
Character growth is also a major theme. Both Naruto and the characters from DxD have room for growth. In these fanfictions, they often learn from each other. For instance, Naruto might learn about the more complex social hierarchies in the DxD world and grow as a person, while DxD characters could learn about Naruto's perseverance and willpower.
Crossover interactions. For example, Naruto might interact with Issei from DxD and they could either become friends or rivals. There are also interactions with the different factions in DxD like the devils, angels, and fallen angels. And Naruto's Saiyan nature might make these interactions even more complex and interesting.