Silena Beauregard is also underrated. She could be the focus in a fanfiction set in the school. Since she was a daughter of Aphrodite, she could use her charm and beauty skills in a different context at school. For example, she could use her powers to boost the confidence of shy students or mediate between feuding groups by using her charm to calm everyone down.
Nico di Angelo is another great choice. He's often in the background but has so much potential. In a school fanfiction, he could be struggling with his dark powers while also trying to make friends at school. His connection to the underworld could add an interesting and spooky element to the school setting, like strange things happening in the basement or during nighttime at the school.
Nico di Angelo is often overlooked compared to Percy. He has such a rich backstory with his connection to the Underworld and his struggle with his identity. Fanfiction could explore more of his inner thoughts and his relationships, especially his friendship with Percy on a deeper level.
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.
Nico di Angelo is often underrated. He has such a complex backstory with his relationship to the Underworld and his struggle with his identity. In fanfiction, you could really explore his internal battles more deeply. Another one is Tyson. He's a cyclops and Percy's half - brother, but he doesn't always get as much attention as he could. You could write about his experiences at Camp Half - Blood and how he overcomes the prejudice some of the other campers have towards him.
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.
I think Grover is a bit underrated in fanfiction. He's Percy's best friend and his role as a satyr could be expanded upon. For example, fanfiction could focus on his search for the lost god Pan. His abilities like being able to sense nature spirits could be used in more creative ways. Also, Clarisse La Rue. She's often just seen as a bully in the original, but in fanfiction, she could be developed into a more complex character. Maybe explore her relationship with her father, Ares, more and her own journey of self - discovery as a demigod. And then there's Rachel Elizabeth Dare. She has the gift of prophecy and that could be the center of an interesting fanfiction story, showing how she copes with this power and her role in the demigod world.
One underrated character is Bob, the Titan. He has a really interesting backstory and his loyalty to Percy and his friends is quite remarkable. Fanfiction could explore his past in more detail, like his time before he became Bob. Another character is Small Bob, the cat. He may seem like a minor character, but there could be a really fun fanfic written about his adventures in the House of Hades, perhaps with his own little quests. Nico di Angelo is also a bit underrated in this context. There could be fanfiction focusing on his internal struggles while in the House of Hades, like his feelings of isolation and how he copes with the darkness of the place.
One underrated character is Tyson. He has so much potential for a fanfiction focus. He's a Cyclops, which makes him different from the other demigods, and his loyalty to Percy is really heartwarming. A fanfiction could explore his backstory more, like his life before he met Percy at Camp Half - Blood. Another underrated character is Clarisse. She's often seen as just a bully, but there could be a lot more to her. A fanfiction could show her softer side and what made her the way she is, perhaps a story about her first quest and how it changed her.