Well, Naruto is bound to be a central figure. Besides him, there could be a villainous character inspired by the Joker from The Dark Knight. His friends, like Kakashi, might also play significant roles. They could be involved in Naruto's journey to clean up the corrupted world in this fanfiction. And there may be some new characters who are either allies or enemies of Naruto, depending on their motives in this darker Naruto universe.
In this 'naruto the dark knight fanfiction', Naruto is the main character for sure. He would be the one trying to bring justice to the world. Sasuke could be a complex character, perhaps having his own motives that sometimes conflict with Naruto's. Sakura might also be there, using her medical skills in a more dangerous and morally ambiguous situation. There could also be a character who is like Commissioner Gordon, someone who helps Naruto in his fight against the dark forces in this new and different Naruto - inspired world.
It could be Kakashi. He has that mysterious and brooding quality like the Dark Knight. He's also highly skilled and has a strong sense of justice. He could be the one who lurks in the shadows of Konoha, protecting it from threats.
Obviously, the Dark Knight himself, Batman. He's the central figure around which the story revolves.
Obviously, the Dark Knight of Zero is one of the main characters. He is the central figure around which the story usually revolves.
In the Dark Knight Story, the most prominent characters are Batman, who is the Dark Knight and protector of Gotham. Then there's the Joker, a deranged and extremely intelligent criminal. Also, Commissioner Gordon plays an important role. He is one of the few in the police force who trusts Batman and often works with him to keep the city safe. These characters drive the story forward with their interactions and their different goals. Batman wants to bring justice, the Joker wants to create anarchy, and Gordon wants to uphold the law in a city filled with corruption and crime.
In the Dark Knight story, the most prominent characters are Batman, who is the Dark Knight trying to protect Gotham. Then there's the Joker, a chaotic and evil villain who loves to create mayhem. Also, Harvey Dent is an important character. He starts as a district attorney with good intentions, but later gets corrupted by the Joker's actions.
In the Dark Knight story, there are several main characters. Batman is the protagonist, a vigilante protecting Gotham. The Joker is a very important character too. He's a maniacal villain with a twisted sense of humor. Then there's Harvey Dent. He starts out as a good guy, a district attorney trying to clean up Gotham, but later becomes Two - Face. These three characters play crucial roles in the story.
As we don't have much information about this 'dark knight dark city story', we can only assume. The obvious main character would be the dark knight. There could be an antagonist, perhaps a powerful criminal lord who rules the dark city's underworld. There might also be a love interest for the knight, a damsel in distress or a strong - willed woman who is involved in the affairs of the city. Additionally, there could be side characters such as street urchins who provide information or comic relief in the story.
There could also be some original characters created specifically for this fanfiction. For example, a powerful ninja who has knowledge about the merge process and tries to either help or hinder Naruto. Or perhaps an ancient spirit that was somehow involved in the creation of Dark Naruto in the first place and now has an interest in the merge.
The Dark Knight himself is surely one of the main characters. There may also be his sidekick or allies like Robin or Commissioner Gordon.
Most likely, Batman is the central figure. And we might also see Commissioner Gordon as an important character. Robin could also make an appearance, being one of Batman's sidekicks.