Obviously, Bella is one of the main characters. There might also be the teachers or students at Sky High like Will Stronghold or Layla Williams.
Bella is surely a main character. Then, depending on the plot, there could be other important characters. For example, if there's a conflict at Sky High, there might be a villain - like a power - hungry student or an outsider who wants to disrupt the school. And of course, there would be Bella's friends at Sky High, who could be characters from the original Sky High story or new ones created for this fanfiction. They would play a role in Bella's experiences, whether it's helping her through tough times or having fun with her during school activities.
The main character is Bella. In addition to her, the principal of Sky High could be an important character. He or she might be the one to guide Bella or set rules that Bella has to follow. Also, there could be a group of students that Bella teams up with. They could have different abilities and personalities. One might be really strong physically, another could be good at flying, and they all work together with Bella in different situations, like when they are trying to solve a mystery at the school or preparing for a big test of their abilities.
Well, it could be about Bella's adventures at Sky High. Maybe she discovers new powers, makes new friends or faces some challenges there.
Caroline Forbes is another character. As a vampire herself in Mystic Falls, she could either befriend Bella or be jealous of her presence. Caroline is known for her strong personality and her relationships within the vampire community.
The main characters would typically be the original characters (OCs) created for the fanfiction. Since it's 'oc fanfiction', these are often new individuals with their own backstories and personalities that the writer has made up.
Princess Bella is obviously a very important character as she is the one going into labor. Her partner or husband would also be important as he would likely be there for support.
The main characters are Edward and Bella, of course. They are likely the focus of the story as it's about their high school reunion.
Bella could also be a main character. She might be the one who bridges the two worlds. Her connection to both the human and supernatural in Twilight could help her in Sky High, where she'd have to navigate a school full of students with extraordinary abilities while also dealing with her own unique situation.
In this crossover fanfiction, Naruto would be a main character. Another important character could be Layla Williams from Sky High. Her power of telekinesis could interact in interesting ways with Naruto's jutsu. For example, they could combine their powers to defeat a common enemy. And of course, Naruto's friends like Sasuke or Sakura might also make appearances in the story, adding more depth to the interactions.
Edward would definitely interact differently. If Bella goes back in time and changes her initial approach, Edward might be more or less intrigued by her. For example, if she's more confident, he might be even more drawn to her than in the original story.
Obviously, Edward would be deeply impacted. He has dedicated himself to Bella, and her new evil nature would force him to reevaluate their relationship. Jacob, who has always been in the mix with Bella, would face a great deal of turmoil. And don't forget Carlisle and the rest of the Cullen family. They have accepted Bella into their family, and her going evil would be a major threat to their way of life and their values.
Since I don't know the exact'sky high real story', I can't say for sure who the main characters are. It could be pilots, mountaineers, or scientists depending on what the story is about.