One great 'Percy Jackson Ancient Greece Fanfiction' is 'The Lost Hero's Quest in Ancient Greece'. It has an exciting plot where the characters are plunged into a forgotten part of Ancient Greek mythology. The author does a wonderful job of weaving in the familiar elements from the Percy Jackson series with new and unique twists from Ancient Greek lore.
Well, a cool plot might be Percy getting lost in time and ending up in Ancient Greece during the Trojan War. He could then have to figure out how to get back to his own time while also getting involved in the events of the war. Maybe he tries to change the outcome of the war, but realizes that doing so could have disastrous consequences for the future. Or perhaps he discovers that there's a secret reason why he was sent back in time, like to retrieve an important artifact that was lost during the war.
First, do your research on Ancient Greek mythology. Know the gods, the monsters, and the heroes well. For example, if you're writing about Percy facing the Minotaur, you need to know all the details about it from the original myths. Second, stay true to the characters of the Percy Jackson series. Percy is brave but also has a sense of humor, so keep that in his character. Third, create an engaging plot. Maybe it could be about Percy finding a lost temple in Ancient Greece that holds a powerful secret.
The gods also interact with Percy a lot. Zeus might be angry with Percy for interfering in the affairs of the gods in Ancient Greece. Or Poseidon could be guiding Percy secretly, giving him hints on how to deal with the challenges he faces, like when he's on a quest related to the sea.
One interesting adventure could be Percy exploring the lost city of Atlantis in Ancient Greece. He might face sea monsters and ancient traps while trying to uncover the secrets of the city.
He could have adventures like battling mythical creatures. For example, fighting the Minotaur in the labyrinth. Maybe he'd also encounter the gods and goddesses and get involved in their power struggles.
To create believable characters from Ancient Greek mythology, you need to understand their backstories and motives. For instance, if it's a character based on Ares, the god of war. He's not just about fighting, but also about the glory and honor in battle. So your character could be a soldier who is constantly seeking recognition in combat. Also, use their physical descriptions from the myths, like Ares' red hair and fierce appearance, and translate them into modern - day equivalents, like a character with a bright red mohawk and a tough - looking leather jacket.
His birth could introduce new prophecies. For example, the oracles might start predicting things related to Percy's fate that could change the course of events in Greek mythology.
In many fanfictions, Percy is likely to meet ancient Greek heroes such as Heracles. They could engage in some friendly competitions or Heracles could offer his strength to help Percy in a difficult situation. Another character he might come across is Pandora. She could be either a help or a hindrance depending on the plot of the fanfiction as she is associated with the box that contained all the evils of the world.
Well, often in these fanfictions, Percy gets to interact with the ancient Greek heroes in a more in - depth way. He could team up with Achilles and learn some new combat skills from him. And he might be involved in some sort of mystery that is related to the lost artifacts of ancient Greece. Maybe he has to find a certain magical item that was once used by Zeus himself to save the world from a new threat.