Mischievous or mysterious side characters are also common. They might be the ones causing the unexpected happenings or be involved in them in some way. For example, a small - time thief who accidentally steals an item that has magical powers and then all kinds of unexpected things start to occur around him. They add an element of chaos and intrigue to the story.
One interesting plot could be a character who is supposed to be a sidekick suddenly gaining superpowers and becoming the main hero. This unexpected turn can create a whole new dynamic in the story.
One common theme is the breaking of social barriers. For instance, in a fanfic set in a high school, a popular kid might unexpectedly fall for an outcast. Another theme is the discovery of hidden qualities. Maybe a character who seems cold at first reveals a warm and loving side only to the one they unexpectedly fall in love with.
It's hard to say without reading it specifically, but it could be new characters created by the fanfic author. They might be ordinary humans who get involved with the Twilight characters. Or perhaps it's a different take on the main Twilight characters themselves, like Bella and Edward finding love in a more unexpected way than in the original story.
Since I haven't had the chance to read 'the great unexpected a novel', it's hard to say exactly who the main characters are. But in a lot of novels like this, there could be a young, idealistic character who is eager to understand and overcome the great unexpected. There might also be an older, wiser character who provides guidance and perspective as the unexpected unfolds.
I'm not sure specifically as there's not enough information given. But generally in a graphic novel, the main characters could be a hero on a quest, or a group of friends facing a common problem.
One common theme is identity crisis. When an unexpected event occurs, characters often question who they are. For example, if a character discovers they have a long - lost family with a dark secret, they might struggle with their sense of self.
Often, the main characters are ordinary people. For example, a housewife who discovers something unusual in her attic. These normal - seeming individuals are then thrust into extraordinary and unexpected circumstances. Their reactions to these situations are what drive the stories forward.
Since it's a 'Tales of the Unexpected' kind of story, the main characters could be very diverse. It could be a group of friends who have different personalities. One might be a joker, another a serious and practical person. And during Christmas, their differences might lead to some unexpected situations. There could also be a local shopkeeper who plays an important role in the story, maybe he has some hidden knowledge or a special gift that is relevant to the unexpected events of the story.
Obviously, the two central characters are Harry and Ginny. Harry is known for his courage and his lightning - bolt scar. Ginny, on the other hand, is a strong - willed character. She has her own set of magical skills and is very much a part of the Gryffindor house. In this fanfiction, they are likely to be the focus, with their relationship and adventures at the center of the story.
I'm not sure as I haven't read the story, but usually there would be the host or hosts and of course the unexpected guest.