Edward and Bella would likely still be main characters. Their relationship could be tested in new ways because of the events related to the Earth's movement. For example, if the Earth's movement causes some natural disasters, Edward would be very protective of Bella during such times.
The werewolves like Jacob could also be main characters. They might have to adapt to the changes brought by the Earth's movement. Maybe they need to find new ways to protect their territory or deal with the vampires as the environment changes due to the Earth's movement.
It could be about how the movement of the Earth affects the characters in the Twilight universe. Maybe the changing of seasons due to Earth's movement impacts the vampires' activities. For example, in winter, they might have less trouble hiding their cold skin as the cold weather is more common.
I'm not sure exactly who the main characters are without reading it. But it's likely that there are characters representing both heaven and earth. Maybe an angel - like figure from heaven and a mortal or some kind of earth - bound spirit could be main characters.
Edward could also be a great main character. His ability to read minds could come in handy when trying to figure out the alien's intentions. He might be initially distrustful of the alien, seeing it as a potential danger to Bella and his family. But as he gets to know more about the alien, he could develop a more complex relationship with it.
Maybe Jacob could be a main character. He could be in Vegas for some reason and cross paths with a Twilight couple on their honeymoon. His presence could add some tension and a different dynamic to the story.
Another possibility is that it could involve a new character created specifically for this fanfiction. This character could be a hybrid of Twilight - like abilities and some form of super - speed, and they could be the one sharing the kiss with either a well - known Twilight character or a Flash character.
Leah Clearwater could also be a central character. She has her own complex story within the wolfpack. Maybe a visiting werewolf from another pack, who is more open - minded about poly relationships, could come into the story and start a relationship with Leah and some of the male pack members. Another option could be Seth Clearwater, as he is a likable character and could be part of a poly relationship dynamic within the pack.
Well, obviously the princess would be one of the main characters. She could be a strong - willed and kind - hearted princess from a far - off land. As for the Twilight side, a vampire like Edward could be a main character. His brooding nature and special powers would create an interesting dynamic with the princess.
Bella and Edward could be the main characters. Imagine Edward working part - time at the coffee shop to blend in with humans. Bella, a regular customer, is immediately intrigued by his pale complexion and mysterious eyes. They start a relationship that unfolds within the coffee - shop setting, with all the challenges of a human - vampire love story, like Edward's struggle to control his thirst and Bella's acceptance of his nature.
The main characters are likely to be the ones from the original 'Twilight' like Bella, Edward, and Jacob. In fanfiction, they might be portrayed in different lights or with different personalities.
The obvious main characters could be the leaders of the Dark Knights themselves. They are the ones driving the actions and decisions of the group.