Percy himself is very interesting. His courage and his powers make for great stories in Tartarus with the added element of nightmares. Annabeth is also a good choice. Her intelligence is put to the test, and the nightmares can play on her insecurities. Nico is another one. His connection to the underworld and his own dark past add depth when he's in Tartarus dealing with nightmares.
Definitely Percy. He has so many aspects to explore. His loyalty to his friends, his relationship with Annabeth, and how the Tartarus nightmares affect these. Grover could be an interesting character too. His role as a protector and his fears, which can be magnified by the nightmares in Tartarus. And we can't forget Luke. Even though he's a more complex character, his past actions and possible redemption arcs can be well - explored in the context of Tartarus nightmares.
In my opinion, Percy is the most obvious but also the most engaging. His journey through Tartarus is filled with potential for character development, especially when nightmares are involved. Thalia could be a great character to write about. Her strength and her family ties can be shaken by the nightmares in Tartarus. And Clarisse too. Her tough exterior might crack under the pressure of Tartarus and the nightmares, revealing a more vulnerable side.
Percy himself is often very popular. He's the main character in the original series, so in fanfiction about Tartarus, his journey and how he overcomes the challenges there are always interesting. Annabeth is also a popular character. Fans love to write about her either trying to rescue Percy or being part of his adventure in Tartarus. Nico di Angelo is another one. His powers and his somewhat dark and mysterious nature make him a great addition to Tartarus - related fanfictions.
Well, Percy himself is of course the main character. Annabeth would also be very likely to be there. Their relationship is a big part of the Percy Jackson series, and in a Tartarus - related fanfiction, she could be either with Percy from the start or trying to find a way to rescue him. Grover might also show up. His loyalty to Percy and his skills as a satyr could be useful in the dangerous environment of Tartarus.
One common theme is the extreme danger and horror of Tartarus. Fanfictions often explore how Percy and his friends face terrifying creatures and situations there. Another theme could be the psychological impact of the nightmares. The nightmares might represent the characters' deepest fears, like losing their friends or failing in their quests. Also, the theme of survival against all odds is popular. They have to use their wits and powers to get through Tartarus alive while constantly being haunted by nightmares.
Obviously, Percy Jackson himself is a main character. Annabeth might also be very involved, either helping him escape or being there to welcome him back. Grover could be another main character, perhaps using his nature - related powers to assist in some way.
There could also be some characters unique to the fanfiction. Maybe a new demigod who has some special power related to Tartarus and ends up joining Percy on his quest. Or perhaps an ancient being who was imprisoned in Tartarus long ago and has knowledge that Percy needs to complete his mission.
In some more creative fanfictions, new characters might be introduced. For example, a powerful demigod who was born in Tartarus and has unique abilities. These new characters can add a fresh twist to the story, interacting with Percy and the others in unexpected ways, and often bringing new plotlines related to the mysteries of Tartarus.
Definitely Percy. His journey as a demigod, his encounters with various monsters and gods, and his growth throughout the series give a lot of material for fanfiction. Another interesting character is Nico di Angelo. His dark past, his powers related to the underworld, and his complex relationship with Percy can lead to some really engaging fanfiction stories. And we can't forget about Thalia. Her role as a daughter of Zeus and her leadership qualities make her a great character to explore in fanfiction.
He would surely interact with Annabeth. Their relationship is central in the Percy Jackson series, so in a Tartarus fanfic, she'd likely be there to support him or be in a similar situation as him.
Percy himself is really interesting. His character has a lot of room for development in fanfiction. You can explore his powers more deeply, or his relationships with other characters in new ways. Annabeth is also great. Her intelligence and her role as a strategist can be expanded upon. And Grover, with his connection to nature and his loyalty, offers a lot of potential for interesting storylines.
In some fanfictions, Percy uses his sense of humor as a coping mechanism. He might make light - hearted jokes about the Tartarus situations in the nightmare to Annabeth when they wake up. Annabeth, on the other hand, might try to analyze the nightmares. She'd break down the elements and figure out what in their subconscious is causing these dreams.