Obviously, the main characters from 'the order' could be the main characters in this fanfiction. They are the ones who would be traveling to the future or interacting with future elements.
It could also include new characters from the future. For example, a future wizard or witch who has unique powers that the characters from 'the order' have never seen before. These new characters could either help or hinder the Order in their journey in the future. Maybe there's a future seer who can see the true intentions of the Order and decides whether to guide them or not.
There could be a combination of old and new members. The old members with their deep knowledge of the order's history and magic, and the new members with their adaptability. Together, they can face the challenges of the future, learn from each other, and perhaps change the future as well as the order itself for the better.
Toothless is another great candidate. As Hiccup's dragon, he has a unique bond with his rider. In a past - meets - future story, he could be the one to sense the disruptions in time. He might also meet his descendants or ancestors in the future or past dragons, which could lead to some really interesting interactions. For example, an ancient dragon from the past might teach Toothless a long - lost skill that helps them in a future battle.
It could involve time travel. Maybe a character from 'the order' travels to the future and has to adapt to new magical or technological advancements there. They might encounter new forms of magic or face challenges that the future presents.
It could be Harry Potter's descendants. They might inherit his courage and magical abilities and be the main characters who navigate the encounter between Hogwarts and the future.
The main characters are clearly Stoick and Hiccup. Stoick is Hiccup's father, and in this fanfiction, their encounter forms the central plot. Hiccup, as the character from the future, has likely developed and changed a great deal since Stoick last saw him.
The main characters are Keith and Lance from the present. Keith, the hot - headed but skilled pilot, and Lance, the charming and sometimes over - confident one. Their future selves, who might have different personalities based on their future experiences, are also central to the story. For example, their future selves could be more mature and wiser, and these differences will drive the story as they interact with the present Klance.
The main characters are clearly Klaus and Future Hope.
It could be a new teacher at the school who has very strict and old - fashioned views. This teacher doesn't believe in the progressive teaching methods that Riley and Maya want to implement, and constantly tries to undermine them. For example, the teacher might try to get their classes cancelled or their teaching materials removed.
It could be a new villain from the future that somehow follows future Gohan back in time. This villain might be an evolved form of an existing enemy, stronger and more cunning. They could be after the secrets that future Gohan holds about the future technology or the power levels of the Z - fighters in the future.
Obviously, Bakugou would be one of the main characters as the story focuses on the encounter with his future self. And also, Deku would likely be a main character. Their relationship has always been a central part of the story, and seeing how Deku reacts to future Bakugou would be interesting. Additionally, Ochaco could be a main character as she has her own unique relationship with both Bakugou and Deku, and her presence could add some different dynamics to the interactions in the fanfiction.