Well, Harry Potter himself is likely to be one of the main characters. He's the central figure in the original series, and in this fanfiction, he'll probably be interacting with the seer in important ways.
Hermione Granger might also be a main character. Her intelligence and knowledge of magic could be crucial in understanding and perhaps even helping the seer with their visions. She could be the one who figures out how to use the seer's knowledge to prevent disasters or defeat enemies.
It's possible that some of the minor characters from the original series could have larger roles in this fanfiction. For instance, Neville could become an important ally to Harry in dealing with the implications of his seer abilities. And maybe some of the Weasley family members could be more involved, especially if they are affected by Harry's newfound powers.
There could be a new character introduced, a healer perhaps, who is intrigued by Harry's condition as a blind seer. This character could play an important role in trying to understand the nature of his seer abilities and whether there is a way to either enhance or control them. Another possibility is a rival seer who is jealous of Harry's unique situation and tries to undermine him throughout the story.
I don't know for sure without reading it, but it's likely to include Harry Potter himself, as it's a Harry Potter fanfiction. He's usually the central character in most such works.
Most likely, Harry Potter would be one of the main characters. Since it's related to the Harry Potter universe, he is usually at the center of such stories. Hermione Granger and Ron Weasley might also be main characters as they are Harry's closest friends and often involved in his adventures.
Well, in many Harry Potter fanfictions, aside from the well - known characters, the author might introduce some original characters. So in 'A Chance in Time', there could be a new character who is the key to the whole 'chance in time' concept. However, it's also very possible that it focuses mainly on Harry and his friends. Maybe Harry discovers something about his past that gives him this 'chance in time' and he has to rely on Hermione's intelligence and Ron's loyalty to make the most of it.
One interesting plot twist could be the seer seeing a future where Voldemort is actually a puppet of a more powerful dark wizard hidden in the shadows. This would completely change the power dynamics in the wizarding world.
One great fem Harry Potter seer fanfiction is 'The Seer's Path'. It has a unique take on Harry as a female seer, exploring how her visions impact her relationships with friends like Hermione and Ron. Another is 'Seer of Hogwarts' which delves into the political intrigue at Hogwarts as the female Harry uses her seer abilities to uncover secrets.
Obviously, Harry Potter himself could be a main character. He has a natural inclination for getting into extraordinary situations, and a time - twister situation would be right up his alley. Hermione would also be a great main character as she's intelligent and has experience with time - related magic through the Time - Turner. Ron could be there too, providing his loyalty and humor in the face of time - twisting chaos.
Hermione Granger would definitely be a huge help. She's extremely intelligent and well - read in magic. She could study all the books in the library to find a way to break the time loop. Ron Weasley could also be important. His loyalty and courage would keep him by Harry's side through all the loops, and he might come up with some practical, if not always academic, solutions.
Harry Potter himself could be a main character. He might use time travel to gain more knowledge about his parents or to change some of the events that led to their deaths.