Another possibility is that the fanfiction could introduce new characters who play a major role in the 'coming home' story. They could be new vampires or humans who have a connection to the original Twilight characters. For instance, a new vampire who was turned while Bella was away and now she has to deal with this new presence when she comes home, and this new character could bring a whole new set of conflicts and relationships into the story.
Bella Swan is a very likely character. Since she has such a strong connection to Forks, which is her home in the Twilight world. Her journey home could be filled with thoughts of Edward and the vampires she has come to know.
Obviously, Minato would be one of the main characters. Naruto would also be a central figure as Minato's son. Sakura and Sasuke might also play important roles, as they are Naruto's friends and comrades. Kakashi, who was Minato's student, could also be a major character.
Typically, there is a character who has experienced a significant change while away from home. Maybe they've become famous or successful in a far - off place. But when they come home, they interact with local characters such as old neighbors or childhood friends. These local characters are also important main characters as they represent the home environment that the returning character is re - entering.
I don't know for sure as I haven't read it. It could be a family - centered story, so the main characters might be parents, children, and perhaps grandparents.
Well, Bella and Edward would probably still be main characters. Since it's Twilight - related, their relationship is central. They might be exploring new aspects of their relationship in this 'whole new life' scenario.
Maybe an old storyteller who has a deep connection to the area with the cracked pavement and during twilight shares tales of the past with the younger generation. There might also be a group of friends who use the cracked pavement as their meeting place at twilight, and they get into all sorts of adventures together.
His childhood friends are also common main characters. They might be characters who have known Harry since they were kids and their relationships are explored in the fanfiction. They could be excited to see him again and have all kinds of adventures planned for when he's back.
Another possibility is that the main character is a child. Coming home in the dark can be a particularly scary experience for a child. There could be parents or guardians involved in the story too, either as absent figures that the child is longing for or as overbearing presences that the child is trying to escape from. And depending on the genre of the story, there could be supernatural elements like ghosts or monsters that the main character, whether a child or an adult, has to face during their journey home in the dark.
The baby itself could be a sort of main character in a way. It might have its own unique personality, even as a baby. And it could be the focus of the story as the characters try to protect it, raise it, and figure out what kind of future it will have in the Twilight world.
The main characters would most likely still be the Cullens. Edward, Bella, and their daughter Renesmee. Also, Jacob would probably be a major character as his relationship with the Cullens and Renesmee was a big part of the story.