In Percy Jackson fanfiction, Percy himself is often considered the greatest hero. He has all his demigod powers and his experiences from the original series which make him a natural choice. He's brave, resourceful and has a strong sense of justice.
In Percy Jackson fanfiction, for a character to be the greatest hero, they need to have a clear goal that benefits the greater good. It could be saving the camp from a new threat or finding a way to stop a prophecy from causing destruction. Their relationships also matter. A hero who is respected and loved by their friends and allies is more likely to be considered great. For example, Percy has a great group of friends who support him, and his loyalty to them and their loyalty to him enhance his heroic status. Also, the ability to grow and learn from mistakes is crucial. A character who starts off a bit flawed but becomes better over time is a great hero.
Well, in fanfiction, Percy's ability to adapt quickly makes him a true hero. He can shift from his normal life to the dangerous world of the gods and monsters with ease. He also has a great sense of humor which helps him and his friends get through tough times. And his self - sacrifice is a key factor. He's willing to put himself in harm's way to protect others, just like when he took the lightning bolt to save the world from a war among the gods.
It could be a rogue demigod who has a vendetta against Percy. This demigod might have spread the false rumors that led to Percy's banishment in the first place, and now he wants to make sure Percy never returns. He uses his own powers and manipulates other demigods and monsters to achieve his goal.
One possible main antagonist could be a corrupted demigod. Maybe someone who was once Percy's friend but became power - hungry and turned against him when Percy became a hero king. This demigod could form an alliance with some of the more malevolent creatures from the Underworld, like the Furies. Another antagonist could be a powerful sorcerer who uses dark magic to try and undermine Percy's rule. The sorcerer could be from a long - forgotten line of magic - users in the Greek world who have a vendetta against the demigods.
It could be a demigod who was once a hero but became corrupted by power. Maybe they were overlooked for some big honor at Camp Half - Blood and now they seek revenge on Percy and the other heroes. This character could have powers similar to Percy's but use them for evil, like causing tsunamis to destroy coastal cities instead of protecting them.
In 'Percy Jackson Broken Hero Fanfiction', an interesting concept could be Percy's isolation as a broken hero. He might be physically or emotionally separated from his usual support system. This isolation could force him to rely solely on himself, which is a big change from his normal reliance on his friends. It could also show his journey of self - discovery in this new, more solitary state, and how he might come out stronger in the end despite the initial 'broken' state.
One idea could be Percy having to face a new and powerful underwater monster that is immune to his usual water - based powers. He'd have to rely on his wits and the help of his friends in unexpected ways. Another could be a time - travel story where Percy goes back to the era of the first demigods and has to learn from them to solve a modern - day problem. Maybe he teams up with an ancient hero and they combine their powers.
There could be a healer character. Since Percy is a broken hero, someone with the power to heal his physical or emotional wounds might be introduced. This character could have their own backstory and motives, perhaps being related to an ancient Greek deity of healing in a new and unique way.
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.