Some of the main characters from DxD like Issei Hyoudou might also be main characters in these fanfictions. He could interact with the Naruto characters, perhaps learning new fighting techniques from them or having to team up to face a common enemy.
Naruto is often a main character as he is the protagonist of Naruto and his skills and personality make for an interesting addition to the DxD world. His determination and never - give - up attitude can drive the plot forward in the crossover.
If there is a Rabbit - related character from Naruto, like Kurama in his smaller form which could be considered somewhat rabbit - like in appearance, it could be a main character in the fanfiction. It could bring its own set of powers and knowledge from the Naruto world and have unique interactions with the DxD characters.
Kakashi could be another important character. His intelligence and wide range of ninja techniques can bring a different aspect to the story. And for the Autobots, Ratchet is often used. His role as a medic can be interesting when combined with the ninja's healing techniques in Naruto.
Sasuke can also be a main character in such fanfiction. He might have a different view on the blue bird's significance compared to Naruto, which can create interesting storylines.
The dragonborn himself is, of course, a main character in these fanfictions. Depending on the story, other DxD characters like Akeno Himejima could also be involved. She has her own powers and personality, and her interactions with the dragonborn can add a lot of depth to the story. Her seductive nature might play off against the dragonborn's more straightforward and perhaps stoic personality.
In many Naruto Black Rabbit fanfictions, Naruto is the central figure from the Naruto side. He is the one who often welcomes Black Rabbit into his world, whether knowingly or unknowingly. Black Rabbit, on the other hand, is the new element introduced. She could be the catalyst for change in the Naruto universe. Other characters like Sakura might also play important roles, for example, if there is a medical emergency where her skills are needed while Black Rabbit is around. They could learn new medical techniques from each other.
Often, the main characters are still Bella and Edward. In Poison Twilight fanfiction, they might be facing new challenges related to the 'poison' element. For instance, Edward could be trying to protect Bella from a poisonous threat that targets her specifically because of her unique scent or connection to the vampire world.
Obviously, Escanor is a main character. He is often the center of the story due to his powerful presence. In addition, characters from the original Highschool DxD like Issei might also be involved. Issei could be a friend or a rival to Escanor in the fanfiction, adding an interesting dynamic as Issei is known for his own growth and development in the original series.
Well, aside from Naruto and Issei, there could be other important characters. Rias Gremory, who is a devil princess in DxD, might play a significant role. She could be curious about Naruto and his powers, or she might even see him as a potential ally or threat. Also, characters like Akeno Himejima, Kiba Yuuto, and others from the DxD series could be part of the story and interact with the reborn Naruto in different ways.
The main characters can include the gunsmith, who might be an outsider to the traditional ninja world but has a unique skill set. Another could be a ninja who becomes the gunsmith's protector or partner. For example, Sasuke could be interested in these new firearms as a way to enhance his own power. And sometimes, there are original characters created specifically for the fanfiction, like a rival gunsmith who tries to outdo the main gunsmith in creating the most powerful weapons.
Often, there are also antagonist assassins who are main characters in a sense. They drive the plot by creating conflict. These assassins could have their own motives, like working for a powerful and shadowy organization. Their backstories, which might include things like being orphans trained from a young age to be killers, can add depth to the fanfiction.
Naruto himself could be a main character in such fanfiction. Maybe he gets framed for pickpocketing and has to clear his name while also dealing with the real pickpocket who is causing chaos in the village.