Well, a plot idea could involve Percy being sent on a mission to protect a sacred place of Athena that is under threat from a dark force. Along the way, he meets other demigods who are either helping or hindering his progress. He also has to deal with his own identity crisis as he tries to understand what it means to be the son of Athena. There could be a sub - plot about him uncovering secrets about Athena's past that she has been hiding from the other gods.
One idea could be Percy going on a quest to find a lost artifact of Athena that has the power to restore balance in the world of the gods. Another could be Percy having to face off against a powerful enemy who is specifically targeting him because of his relation to Athena. Maybe he discovers some long - lost siblings also sired by Athena during his adventures.
A great plot could be Percy getting caught in a power struggle between Athena and Poseidon's followers. Since he is the son of both, he is a symbol of unity or a threat, depending on how different groups view him. He could be forced to prove his loyalty to both sides while also trying to maintain peace among them. This could involve battles, political intrigue, and lots of character development as he tries to figure out where he truly belongs in this complex world of gods and their followers.
Another plot could involve Percy having to prove himself to the children of Athena. Since he's not a child of Athena, they might be skeptical of his abilities at first. But as they face challenges together, like deciphering ancient prophecies that are hidden in Athena - related temples, Percy shows his worth through his quick thinking and battle skills. This could lead to a great friendship and mutual respect among them.
One idea could be Percy struggling to fit in with Athena's children at first. Since he's used to being a son of Poseidon, he has different ways of thinking and acting. Another plot could involve him using his newfound Athena - given wisdom to solve a really complex mystery in the demigod world. Maybe he discovers a new prophecy related to Athena that only he can understand because of his unique position as her adopted son.
One idea could be that Percy has to seek Athena's wisdom to solve a complex mystery in the mortal world that is somehow related to the gods' ancient secrets. Maybe it involves a powerful artifact that was lost long ago and only Athena's knowledge can lead Percy to it.
Perhaps Athena's love for Percy causes a rift between her and her daughter Annabeth. This could lead to a complex story of family drama, loyalty, and love. Or, in some fanfictions, there could be a plot where Athena's love is a curse placed on her by an enemy, and Percy has to find a way to break the curse, all while they both struggle with their new - found emotions.
Another plot could involve Percy getting a vision from Athena about a future threat to the demigod world. But the vision is so cryptic that he has to work closely with Athena to decipher it. Along the way, they build an unexpected bond, different from his usual relationships with other gods. Maybe Percy starts to see Athena not just as a powerful deity but as a mentor figure, and Athena starts to respect Percy's tenacity more than she expected.
One plot idea could be that Athena tasks Percy and Annabeth with a special quest that involves retrieving a long - lost artifact of hers. This could test their relationship as they face various challenges together. Another could be that Athena reveals a long - hidden secret about Annabeth's family that Percy has to help her come to terms with. Maybe it's something that changes their perception of their destinies within the demigod world.
One idea could be a new quest where Percy and Annabeth have to find a lost artifact related to Athena that was stolen by a rogue demigod. This would involve them traveling to new and dangerous places, facing off against mythical creatures they haven't encountered before.
One idea could be Percy trying to prove himself worthy in Athena's eyes. Since he's her brother in this fanfic, he might strive to show his intelligence and strategic skills, much like Athena is known for. Maybe he enters a competition within the demigod world that tests both physical and mental prowess.
One idea could be that Percy needs Athena's help to save his friend who has been trapped in a maze created by an ancient enemy. Athena uses her wisdom to guide Percy through the various traps and challenges in the maze. Another could be a story where Athena asks Percy to retrieve a powerful artifact that has been stolen from her temple. Along the way, Percy has to use his skills and Athena's advice to overcome different obstacles.