In crestfallen Harry Potter fanfiction, some underrated characters that could be explored are Hannah Abbott. She has a connection to Hufflepuff house, and in a situation where things go wrong in the wizarding world, her loyalty and determination could be put to the test. Also, Blaise Zabini. He has an air of mystery around him, and in a crestfallen scenario, his family secrets could come to the surface and cause him distress. And then there's Parvati Patil. She has been more of a side character, but in this type of fanfiction, her experiences with magic and her relationships could be explored more deeply, especially if she is facing a situation that makes her feel crestfallen, like a rift in her friendship with Lavender or a setback in her magical studies.
In crestfallen Harry Potter fanfiction, a prevalent theme is the disappointment in the wizarding society. After all the battles and sacrifices, if things don't turn out as expected, characters can become crestfallen. For instance, if new laws are passed that restrict magic use in a way that seems unfair. Another theme is the broken dreams of the characters. Harry himself might have dreamed of a peaceful post - Voldemort world, but if there are still dark forces lurking, he would be crestfallen. And the theme of unrequited love can also be common. A character might be in love with someone who doesn't feel the same way, adding to their feelings of being crestfallen.
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.
One underrated character for Harry Potter OotP fanfiction is Seamus Finnigan. He had his own doubts about Harry in the original story. You could expand on that. What if he had a change of heart in a more in - depth way? Maybe he discovers something that makes him fully trust Harry again. Also, Parvati Patil could be a focus. She could have her own side story about her Divination skills and how they might play a role in the bigger battle against the Dark Lord.
Definitely Firenze. He made an appearance in this book, but in fanfiction, he could be more involved. Since he has unique insights as a centaur, he could play a key role in helping Harry understand the prophecies or the true nature of the events related to Sirius. Also, consider Madam Pomfrey. She's often overlooked, but she could be a great source of knowledge about past students and events at Hogwarts that might be relevant to the situation with Sirius.
Neville Longbottom is often underrated. In a fanfiction, he could have a more central role within the castle. Maybe he discovers a hidden herb garden in the castle grounds that has magical plants with the power to heal any wound. Another could be Luna Lovegood. She could find a secret room in the castle filled with strange and wonderful magical creatures that only she can communicate with.
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.
Steve Randle is often overlooked. He could be explored more in fanfiction. He's a loyal friend to Sodapop and has his own dreams and fears. Fanfiction could show his life outside of just being a greaser, like his relationship with his family or his plans for the future.
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.
Polly Chapman is quite underrated. In fanfiction, you could explore her life more. Maybe she has a secret talent for magic that no one knows about. Another could be Craig Bowker. He could have his own story, perhaps he's involved in some kind of underground magic club at Hogwarts that's not related to the main plot of the cursed child.