Definitely consider including Thalia. She's a powerful demigod with her own set of skills and a complex backstory. Her interactions with Percy and the others can be really engaging. Another character is Tyson. He's Percy's cyclops half - brother and his naivete and strength can make for some funny and exciting moments in the fanfiction. Also, don't forget about Clarisse. Her tough - girl attitude and rivalry with Percy can be used to build great tension.
Annabeth is a great character to include. She's smart, strategic, and her relationship with Percy adds a lot of depth. Grover is also good. His loyalty and his connection to nature can bring interesting storylines. Nico di Angelo can be a really cool addition too. His powers over the dead and his somewhat brooding personality can create some great drama.
Annabeth is a great choice. Her intelligence and strategic thinking could add a lot to the story. For example, when Percy and Grover are in a tight spot, she could come up with a clever plan to get them out. Another good character is Tyson. His strength and loyalty would be useful in battles and dangerous situations.
Jason is another good choice. He has a history with both Percy and Reyna. His leadership skills and his connection to the Roman side of the demigod world could bring in new plotlines. For example, he could help Percy and Reyna understand some of the more complex Roman demigod politics that they need to navigate.
Annabeth is always an interesting character. In fanfiction related to Percy's pain, she can be a source of support or sometimes a cause of additional stress for Percy. For example, if Percy is in pain because he fears losing her, it shows the depth of their relationship. Grover is also great. His loyalty to Percy can be explored in new ways. He might be trying to help Percy through his pain, using his nature - related powers or just his friendship.
Aside from Percy, Jason Grace is often included. He has his own set of powers and experiences from being a Roman demigod, which can create great conflicts and alliances in fanfiction. Piper McLean is also a great character to add. Her charm - speak ability can be used in really creative ways in a story. And of course, Leo Valdez with his mechanical skills and humorous personality can add a lot of fun and action to the fanfiction.
Annabeth would be a great addition. Her intelligence and strategic thinking could add a lot to the story. For example, in a situation where Percy and Thalia are stuck in a maze - like the Labyrinth - Annabeth's knowledge of architecture and mythology could help them find their way out. She could also create some interesting relationship dynamics, like a friendly rivalry with Thalia.
The Hunters of Artemis could be a great addition. Since Thalia was once a part of them, it would be interesting to see how she interacts with them again, especially in the context of her relationship with Percy. Zoe Nightshade, if brought back in some way, could be a very cool character to include. She has a strong personality and a tragic backstory. Also, Clarisse La Rue could be in the story. Her tough - as - nails attitude and her rivalry with Percy could spice things up, especially when it comes to the relationship between Percy and Thalia.
Annabeth is a very popular character to include. Her intelligence and strategic thinking add a lot to the story. She can be the one who figures out complex puzzles or comes up with battle plans. Grover is also great. His loyalty to Percy and his connection to nature can create interesting storylines, like when he discovers a new, endangered species in the woods near Camp Half - Blood. Another character is Nico. His dark powers and his often - brooding personality can bring a different kind of tension to the fanfiction. He could be struggling with his powers or his past, and Percy and the others have to help him.
Nico di Angelo would also be an interesting character to bring in. His dark past and his connection to the underworld could provide a contrast to the more positive and light - hearted relationship between Percy and Rachel. He might have his own motives that either help or hinder Percy and Rachel's mission.
There could be Annabeth. She is Percy's close friend and often plays a crucial role in Percy's adventures. In a situation where Thor kneels to Percy, she might be there to witness it and offer her own thoughts or reactions.
Grover would be a great addition. In an AU, he could be Percy's best friend who is always getting him into (and out of) trouble. For example, in a college AU, Grover could be the one who convinces Percy to join a wild fraternity. He could also provide some comic relief. Another good character is Thalia. In a superhero AU, she could be a powerful superheroine with lightning powers. She could be a mentor or a rival to Percy and Annabeth, depending on the plot.