The main characters are surely Carly and Freddie. Carly, who has just returned from Italy, is likely to be different in some ways. Freddie, on the other hand, has been in the same place. Their reunion forms the core of the story. Additionally, secondary characters like Spencer, Carly's brother, could also be involved. He might notice the changes in Carly and how they affect her relationship with Freddie, and his reactions could add some comedic or supportive elements to the fanfic.
Well, it could be that Carly's return from Italy makes Freddie realize his true feelings for her more strongly. She might have changed in some ways during her time in Italy, like having a new sense of style or a more mature outlook on life. This could attract Freddie even more, and they could start to have deeper conversations and shared moments that bring them closer together in the context of the Seddie storyline.
Marty McFly and Doc Brown are most likely to be the main characters. They are the central figures in the 'Back to the Future' franchise, so it's expected that they would be the focus in this fanfic set in 2015.
In the fanfic, Carly and Misty are the main focuses. Carly might be involved in uncovering a mystery or facing a challenge, and Misty could be there to support her or have her own role in solving the problem. Their relationship, whether it's a friendship or a more complex dynamic, is what the fanfic would be centered around.
Obviously, Natsu and Lucy would be the main characters. They are the core of the 'nalu' relationship. Their relationship is central to the fanfic, and the family aspect would likely revolve around them.
Obviously, Harry Potter himself. He's the main character who is going to fight back.
I think it'll be Marty McFly and Doc Brown for sure. They have been the central characters throughout the franchise. However, there could also be some new characters introduced. Maybe a new time - traveling partner for Marty or a rival scientist for Doc Brown. But the focus will probably still be on the dynamic duo we all know and love.
Obviously, Carly herself is a main character. Often, her friends like Sam and Freddie might also be important characters in the fanfiction. Her family members, such as her older brother Spencer, could also play significant roles. Sometimes, new characters are introduced in the fanfiction, like a new neighbor who becomes Carly's best friend or a mysterious stranger who has a big impact on Carly's life.
Ichigo would probably be one of the main characters. He's the protagonist of Bleach, so it makes sense for him to be at the sleepover. Rukia might also be there, as she has a close relationship with Ichigo. And Uryu could be there too, since he's another important character in the series.
It could still be Naruto himself. Since he's the central character in the original series, many fanfics would likely continue to build on his story.
Well, obviously Corvo would be one of the main characters. He would bring his own set of skills, like his combat abilities and stealth techniques. Then, from RWBY, Ruby Rose could be a main character. Her leadership skills and scythe - wielding combat style would contrast and interact with Corvo in interesting ways.