Well, Percy is a given. He's the hero of the series. His journey after the war, whether it's about finding peace or facing new challenges, would be a major focus. Then there's Annabeth. She's not only Percy's love interest but also a strong and intelligent demigod. Her role in rebuilding and strategizing post - war would be important. Another character who might be in focus is Thalia. She has a leadership quality and a connection to the Hunters of Artemis. After the war, she could be involved in protecting the demigod world in a different way. And Jason, if he's alive, his experiences in different camps and his relationship with Piper could also be explored in the context of post - war changes.
Percy Jackson himself is almost certain to be a main character. After all, the fanfiction is centered around him after the war. Annabeth Chase would also likely be a main character, as she is Percy's love interest and a powerful demigod in her own right. Grover, Percy's best friend, would probably be there too, still looking out for nature and helping Percy in his new adventures.
Definitely Captain America. He's always been a leader and in the aftermath of Infinity War, his leadership would be crucial in keeping the remaining heroes together. Also, Thor, who has lost so much, would be a great focus. His journey of dealing with his losses and finding a new purpose could be really interesting.
Draco Malfoy would be a likely character. Given his Slytherin status, he would likely have a complex relationship with Percy. He might start off as hostile, seeing Percy as an outsider, but then they could end up having to work together for some reason.
One character that could betray Percy is Thalia. She has her own issues with the gods and her place in the world. Maybe she gets jealous of Percy's growing popularity and power among the demigods. So, she decides to side with an enemy to take Percy down a notch. Additionally, some minor characters that Percy has helped in the past could be the ones to betray him. They might feel indebted to him but also resentful at the same time. An enemy could manipulate their feelings and turn them into traitors against Percy.
Ares could be a likely character. He's always been somewhat of a wild card in the Percy Jackson series. He might betray Percy for his own amusement or to gain more influence in Olympus. Another could be Zeus. He's often paranoid about his power and might see Percy as a threat and betray him to protect his throne.
His mother, Sally Jackson, could play an important role as an ally. She has a strong will and has always been there for Percy. Also, Tyson, his cyclops half - brother, could be a powerful ally with his strength and loyalty. And don't forget about the Nymphs. Some of the water nymphs might help Percy since he has a connection to water.
Percy is the main character so he'll be there. Annabeth will probably be by his side as she often is in his adventures. Leo Valdez could also be a character in this fanfiction. His mechanical skills might come in handy if there are any traps or devices related to the Host of Apophis. Piper McLean could be involved too, using her charm - speak to influence certain situations. And Thalia Grace, the daughter of Zeus, could make an appearance. Her leadership skills and her ability to call lightning could be important in the fight against the Host of Apophis.
Well, Clarisse might be paired with a more aggressive Doom character. She's a fierce warrior in the Percy Jackson series. They could form a powerful duo, fighting side by side against the common enemies. Also, Tyson could be paired with a strong, hulking character from Doom. Tyson is a Cyclops with great strength, and finding a counterpart in Doom that shares that physical power would create an interesting dynamic in the fanfiction.
Percy, for sure. He's the center of the Percy Jackson world. Then there's Tyson, Percy's cyclops half - brother. He could be working in the kitchen of the coffee shop, making giant - sized coffee treats. Clarisse might show up, causing a bit of a ruckus as she demands her coffee strong and fast. And Chiron could make an appearance in human form, sitting at a table and giving Percy some sage advice over a cup of cappuccino. The gods could also make cameo appearances. For example, Dionysus might visit the coffee shop to complain about the quality of the coffee, thinking it should be more like his wine.