There's also a possibility that it could be a minor Death Eater that we don't know much about from the original series. The author of the fanfiction could create a new character who was a Death Eater but is now having doubts. Hermione could be the one to find this person and start their journey of change. This would give the author a lot of creative freedom to develop the character's backstory and their relationship with Hermione.
Yi Shu's novel The Pumpkin Eater was called the Pumpkin Eater because Monica, the protagonist of the story, was a person who liked to eat pumpkin. In the novel, she enjoyed the taste and fun of pumpkin in various ways. At the same time, the story also told some interesting plots about the pumpkin. For example, the protagonist Monica's family life was full of laughter because of the pumpkin, which made the theme of the novel more profound and warm. Therefore, The Pumpkin Eater became a classic image and story in Yi Shu's novels, which was deeply loved by readers.
I think it is. The plot has depth, the action scenes are exciting, and it has a good mix of humor and drama. However, it might not be for everyone depending on personal preferences.