One underrated character is Everett Clopton. You could write about his life before Hogwarts and what led him to be the way he is in the game. Maybe he had a difficult family life that made him so eager to prove himself at school.
Poppy Sweeting is also quite interesting. A fanfiction could explore her deep connection with magical beasts in more detail. For instance, how she came to love them so much and any special encounters she had with rare beasts in her past that haven't been shown in the game yet. She could be the main character in a story where she has to save a group of endangered magical beasts from poachers.
Seamus Finnigan could be a great focus. He's often seen as just a side character, but in fanfiction, he could have his own moment. Maybe he discovers a new spell related to the Triwizard Tournament tasks that no one else knows about. He could use this spell to either help Harry or get himself into trouble while trying to prove himself.
Kreacher is another underrated character. He has a complex backstory and a lot of pent - up emotions. In a Deathly Hallows fanfic, he could be the key to unlocking some hidden secrets in the Black family home that are crucial to the fight against Voldemort. Maybe he discovers a long - forgotten spell or artifact that helps the Order of the Phoenix.
Luna Lovegood is often underrated. In a fanfiction focused on the Deathly Hallows, she could play a crucial role. Her unique perspective and knowledge of the magical world's oddities could help Harry and his friends in unexpected ways. For example, she might have insights into the Elder Wand's true nature that others overlook. Another underrated character is Kreacher. He could be the focus, as his loyalty to the Black family and his knowledge of the old magic could be key in the fight against Voldemort, especially when it comes to the secrets related to the Deathly Hallows.
Luna Lovegood is a great choice. She has such a unique personality and view of the wizarding world. There's so much more that could be explored about her family, her beliefs, and her adventures outside of what we saw in the books. Another is Kreacher. His loyalty to the Black family and his complex relationship with Sirius could be delved into deeper.
Nearly - Headless Nick. He has a lot of knowledge about Hogwarts' history. In a fanfic focused on the Chamber of Secrets, he could be the one to remember an old legend or forgotten fact that helps Harry and his friends. He could also be in danger of being permanently petrified since he's already a ghost, which would add an interesting twist.
Cho Chang. In a parallel universe, Cho could be a more central character. Maybe she discovers a new type of magic that is related to her Asian heritage. This could make her a target for both the good and bad sides. She could also have a more complex relationship with Harry or other characters, not just as a love interest, but as a powerful witch with her own motives and goals.
Pettigrew. He's often just seen as the traitor, but in fanfiction, you could explore his motives more. Maybe he was forced into his actions by some dark magic or a threat from Voldemort that no one knew about.
Luna Lovegood is a beloved character from the original Harry Potter series, and she still has a significant presence in fanfiction related to Harry Potter and Legacies. Her unique personality and magical abilities make her a great character to include in various storylines. For example, she could be a mentor to the new generation of students at Hogwarts, passing on her wisdom and off - beat knowledge.
One underrated character is Luna Lovegood. In fanfiction, she can be developed even more. Her unique perspective and oddball ways can be explored in different scenarios. For example, she could be the key to solving a mystery that even Hermione can't figure out. Another is Neville Longbottom. He has so much potential in fanfiction to be more than just the shy boy who grew into a hero. Fanfics could show his adventures during the summer holidays or his own secret magical experiments. And then there's Kreacher. He's often overlooked, but in fanfiction, his loyalty and knowledge of the Black family secrets could be used in really interesting ways.
Helga Hufflepuff is often underrated. In fanfiction, she could be explored more deeply. She was known for her kindness and inclusivity, but there could be more to her story. Maybe she had some secret adventures that haven't been told yet.