It depends on the specific fanfiction. It could be the original characters from the source material that the fanfiction is based on. They might be adapted to fit the twilight - to - sunset theme.
Often, there are characters who are somehow connected to the beauty and change of the twilight - to - sunset period. For example, a young artist who finds inspiration during this time, or a lonely wanderer who contemplates life as the day turns to night. There could also be supernatural characters like vampires or fairies whose powers are related to the changing light.
There could be historical figures brought back to life in a fictional way. For instance, a famous British writer from the past might be a character, and the story could revolve around their 'unfinished business' or how they would view the modern world. Or perhaps a war hero, and the fanfiction could explore their post - war life and how they coped with the trauma of battle.
Often, the Cullens are main characters in Twilight hospital fanfiction. Since they are vampires, they might interact with the hospital in various ways, like bringing in a human they want to protect or dealing with a situation where their vampire nature is at risk of being exposed in a medical setting.
Sometimes it can be a minor character from the Twilight series who gets into a situation where they are truly trapped in the Twilight world in a different way than in the original story. They then have to find their own path to freedom.
The main characters usually consist of the iconic Twilight characters. For example, Alice with her ability to see the future might interact with the mob characters in interesting ways. And from the mob side, there could be a street - smart character who is not used to the supernatural elements of the Twilight world. Their clash or cooperation can form the core of the story. There may also be secondary characters from both worlds that support the main plot, such as the other members of the Cullen family and the mob henchmen.
Obviously, Bella is a main character. She is often re - imagined as a more powerful and self - reliant version of herself as an assassin. Edward also plays a crucial role, usually being the love interest but also having to deal with Bella's new and dangerous side.
Typically, the main characters would include those from the original 'twilight' series, but with a new spin in the context of the 'hopeless kingdom'. For instance, Bella and Edward might be reimagined as rulers or outcasts in this new kingdom setting.
Often, the black twilight wolf itself is a main character. It can be portrayed as a solitary, yet powerful being. Sometimes, there's a young wolf pup that is just starting to discover its powers and is the focus of the story as it grows and learns about the ways of the black twilight wolves.
Often, the main character is an ordinary person who is suddenly thrust into the twilight world. They are usually confused at first, trying to make sense of their new surroundings. There might also be a wise old guide figure, like an ancient spirit of the twilight, who helps the main character navigate the strange world.
Often, the Hokage or other important figures in the Naruto world could be main characters too. They might be the ones who are trying to keep the peace when the werewolf aspect is introduced. Or they could be the ones trying to understand and control Naruto's werewolf powers, just like they do with his regular ninja powers in the original Naruto story.
Often, the main characters from the original 'Twilight' series like Bella, Edward, and Jacob are still central. However, sometimes new characters are introduced who play important roles in the story related to the concept of second chances.