One possible plot could be that Bill mentors Harry in the art of ancient magic. Since Bill has been around for a while and has dabbled in many different areas of magic, he could introduce Harry to spells and magical knowledge that has been long forgotten. This could help Harry in his future battles or in his general understanding of the magic world.
I really like 'Snape: Harry's Surrogate Father'. This fanfiction takes an interesting approach as it makes Snape into a father - figure for Harry. Snape's mentorship here is not just about magic but also about life lessons. He teaches Harry about love, sacrifice, and the true meaning of family. Another great find is 'Mentor Snape and Harry's Growth'. It shows how Snape's strict yet caring mentorship helps Harry to overcome his insecurities and become a more confident wizard, especially when dealing with his enemies at Hogwarts.
Well, for one, it's a fresh take. Fans are always interested in exploring different relationships within the Harry Potter universe. Flitwick is a respected teacher, and seeing him mentor Harry gives a new dimension to Harry's development. It also allows for the exploration of the charm aspect of magic more deeply. Since Harry has to face many challenges, having Flitwick as a mentor in charms can add new and exciting elements to how he overcomes those obstacles. Moreover, it can show how a less - prominent character in the mentoring role can have a significant impact on the main character, which is always an appealing story element.
At first, it might be a bit awkward as they come from different generations in the wizarding world. But as they spend more time together, they start to understand each other's strengths and weaknesses. Harry admires Bill's knowledge of magic and his courage, while Bill is drawn to Harry's selfless nature.
One plot twist could be that Snape is actually mentoring Harry on behalf of Dumbledore from beyond the grave. Maybe Dumbledore had some secret plan that he didn't get to fully execute, and Snape is now following through with it. Another could be that Snape discovers a new magical ability in Harry that no one else knew about.
Another potential mentor could be a Muggle vet that Harry meets during his studies. This Muggle vet could introduce Harry to non - magical veterinary techniques, which Harry could then adapt for use on magical creatures. This would create an interesting dynamic as Harry bridges the gap between the Muggle and wizarding worlds in his pursuit of becoming a vet.
Hermione is quite popular as a mentor in 'Harry Potter mentor fanfiction'. Given her intelligence and vast knowledge, she can be a great mentor for Harry in various academic and magical areas. Luna Lovegood is also a beloved choice. Her unique perspective on the wizarding world can offer Harry a whole new way of looking at things. Additionally, Remus Lupin is often seen as a mentor. His kind and patient nature, along with his knowledge of the dark arts, makes him a great candidate to guide Harry in fanfiction.
They could be like brothers. Harry has a strong connection with the Weasley family already, and with Bill and Charlie, it could be a natural extension of that. They might look out for each other and support one another in any difficult situation.
He could start teaching Harry some defensive magic in case the abuser tries to come back. Also, Bill might use his connections to find a healer or a counselor who can help Harry deal with the emotional trauma of the abuse.