Zuzana could be one. In fanfiction, we could explore her life more in - depth. Maybe she discovers a hidden talent related to the magical world of Karou. She could also have her own adventure that ties in with Karou's story, like getting caught up in a plot by some minor chimaera or seraphim who think she has some information about Karou.
Issa is another. We could write a fanfiction that delves into her past. What was her life like before she became part of Brimstone's crew? What were her hopes and dreams? And how has her relationship with Karou evolved over time? It could also show her role in the chimaera community from her own perspective.
The old hermit character. He was only in a few scenes but seemed to know a lot. Fanfiction could explore his past and how he came to have his knowledge. There's also the young apprentice who was often overlooked. He might have some hidden powers or a special connection to the treasures that could be delved into.
One underrated character is Baltus Van Tassel. He's Katrina's father and has a big role in the town. Fanfiction could explore his backstory, like how he came to be such an important figure in Sleepy Hollow. Maybe he had some adventures in his youth that are related to the Horseman legend. Another is the schoolmaster before Ichabod Crane. What was his experience in Sleepy Hollow? What did he know about the Horseman that he might have passed on to Ichabod? And then there's the old woman who lives on the outskirts of town. She might seem like a minor character, but she could be a seer or have some connection to the supernatural forces in Sleepy Hollow.
Rock Lee is often overlooked compared to the main characters. A fanfiction could focus on his journey to become an even greater ninja without relying on ninjutsu. Another underrated character is Shino Aburame. His unique bug - related abilities could be explored more deeply in a fanfiction, like how he might use them in different and unexpected ways.
The neighbor who was briefly shown in the movie could be an interesting character to focus on. We didn't really get to know much about him, but fanfiction could explore his story, like how he managed to survive on his own for so long. Maybe he had some unique skills or knowledge that helped him. Another could be the old man who we saw at the beginning. What was his life like before the invasion? Fanfiction could give him a more detailed backstory.
There's also the librarian at the academy. We don't know much about her, but she could be a really interesting character to focus on. Maybe she has a hidden past related to the history of the academy or some ancient magic that could be a great plot point in a fanfiction.
Murtogg is another character that could be explored more. He seems to be a bit of a follower, but there could be a story where he has to take charge. Maybe in a situation where the cursed crew is in a new kind of danger and he has to make decisions that go against his usual timid nature. This could show a different side of him and make for an interesting fanfiction.
Kreacher. In fanfiction, he could be explored more deeply. He has a complex backstory and a lot of untapped potential. Another one is Queenie Goldstein's sister, Tina. She often gets overshadowed by Queenie in the movies, but in fanfiction, her character could be developed further, especially her Auror skills and her relationship with Newt. And there's also Neville Longbottom's parents. Their story before they were tortured into insanity could be a great focus in fanfiction.
Reyna is another one. She's a strong and independent leader. Fanfiction could focus more on her past, her time leading the Roman camp, and how she copes with the different challenges she faces, especially when it comes to interacting with the Greek demigods.
One underrated character is Forager. He has a really unique perspective as an alien among the team. Fanfiction could explore his backstory more deeply, like his life on his home planet before coming to Earth. It could also show how he struggles to fit in not just with the human members of the team but also with the other alien members who may have different cultures.
One underrated character is that old librarian in the academy. He seems to have a lot of knowledge but is often overlooked. Fanfiction could explore his past and how he came to possess such vast knowledge of magic. Another could be the gatekeeper of a certain magical realm. He has a small role in the original but could have a much bigger story about his loyalty and the secrets he guards.