Dumbledore could make an appearance. He might have some hidden knowledge about the Crumple - Horned Snorkack. He could be guiding Harry in the background, providing cryptic hints and advice. Neville could also be involved. He has grown into a brave and capable wizard, and his love for plants and nature could somehow tie into the search for the Snorkack, as it might be found in some remote and magical natural habitat.
Perhaps Luna Lovegood. Since she has a fascination with all sorts of strange and magical creatures, she would be a perfect fit. She could be the one who initially tells Harry about the Crumple - Horned Snorkack fanfiction and gets him interested. Another character could be a new student or an outsider to Hogwarts who has a deep connection to the Snorkack and brings a fresh perspective to the story.
Well, it could be about Harry on a wild adventure in search of the elusive Crumple - Horned Snorkack. Maybe he teams up with some of his Hogwarts friends, and they face all sorts of magical creatures and obstacles along the way. It might also involve some mystery about the true nature of the Crumple - Horned Snorkack and its significance in the wizarding world.
Hermione could be one of the main characters. She would be very helpful as she is smart and well - read in magic. She could offer advice on the best spells to use for building the castle and how to make it structurally sound.
Hermione would definitely be one of the main characters. She would be trying to research a way to either reverse Harry's transformation or help him control his werewolf side. Ron might also be there, at first a bit scared but then standing by Harry's side.
Hermione could be a main character. She might try to figure out why Harry hates himself and be the one to pull him out of that dark place. Ron could also be there, maybe at first not understanding Harry's self - hatred but later becoming a source of support. Dumbledore could be another key character, as he often has insights into the students' minds and could play a role in helping Harry deal with his self - hatred.
Madame Maxime, the headmistress of Beauxbatons, could play an important role. She could be a mentor to Harry, guiding him in his new magical studies at Beauxbatons. She might also be involved in some sort of conflict or mystery that Harry has to help her solve, which could involve the relationship between Beauxbatons and other wizarding schools or some ancient magic within the school.
The adoptive family members could be main characters. For instance, the adoptive parents who might have their own unique personalities and backstories. They could be former Aurors who retired early to focus on raising Harry. There could also be an older sibling in the adoptive family, who might initially be jealous of Harry but later becomes his closest ally.
Voldemort would surely be a main character. With Harry dead as a baby, Voldemort's actions and how he further consolidates his power would be a major part of the story.
There could be new characters introduced in this fanfiction. For example, a local wizard in the place where Harry moves to could become a main character. This wizard could initially be suspicious of Harry but later become his friend. Also, a magical creature that Harry befriends in his new location could be a central figure. It could help Harry adapt to his new surroundings and teach him things about the local magic that he didn't know before.
Dumbledore could also play a role even if Harry has left Earth. Maybe his spirit or some form of his magic reaches out to Harry from afar, guiding him on his journey and providing him with cryptic advice to face the challenges in outer - space - related magic.
Hermione would definitely be one of the main characters. She could be the one to research all about braces in the wizarding library to see if there are any magical implications or ways to make the process easier for Harry. And she would offer him lots of advice and support.