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.
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.
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.
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.
There might also be other Autobots such as Bumblebee. Bumblebee could be Harry's friend, always there to help him out in tight situations. Maybe there's a human - Autobot liaison character who helps Harry understand the Autobots better. And let's not forget, there could be some antagonists from either the wizarding world or the Decepticons' side who play important roles in driving the story forward.
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.
Hermione is often used. Since she's a very intelligent and strong - willed character, it's easy to turn her into a princess figure. For example, she could be a princess who uses her knowledge to solve magical problems in the fanfiction. Harry can also be a main character. Maybe he has to protect a princess in the story, or he discovers that he has some connection to a princess from another magical land. Ron can be included as well, perhaps as a sidekick to Harry when they are on a quest related to the princess.
The main characters are often Elsa and Ariel. Elsa has her ice powers which create an interesting contrast with Ariel's life in the sea. They are both strong female characters with different abilities and backgrounds, so it's exciting to see them interact in fanfiction.
Naruto is the central character in 'naruto dark naruto fanfiction'. But characters like Orochimaru can play a big role. He might see an opportunity in a darker Naruto and try to manipulate him for his own gain. Hinata could also be a main character in some fanfictions. Her love for Naruto might be put to the test as she tries to understand and save Naruto from his dark path. And the Sannin, especially Jiraiya, might be involved as they were important in Naruto's development in the original and could have a role in dealing with his new, darker nature.