A really interesting plot could be that because he's Athena's brother, Percy is suddenly given access to some of Athena's knowledge. But this knowledge comes at a price. He starts to lose some of his own identity as a son of Poseidon. He has to go on a journey, both physically and mentally, to find a balance between his new - found connection to Athena and his loyalty to his father. Along the way, he meets various mythological creatures who either help or hinder him in this struggle for self - discovery.
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 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 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 plot idea could be that Percy, in his adventures, discovers a long - lost prophecy related to Athena. As he delves deeper into understanding it, he starts to develop a new - found respect and a kind of platonic love for Athena. He might see her not just as a goddess but as a key figure in the fate of the world and their relationship could be based on mutual understanding of the greater good.
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 Percy going on a quest that involves uncovering a long - lost secret about his connection to Poseidon that even the gods don't know. Maybe it's a hidden power that only surfaces when he faces a certain kind of threat. Another plot could be Percy having to deal with the jealousy of other demigods because of his special status as Poseidon's son. They might try to undermine him during a crucial mission, adding lots of drama and conflict.
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.
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 Percy having to go on a quest that involves both Athena and Artemis. Maybe he has to retrieve an ancient artifact that is sacred to both goddesses. Another could be a story where Percy gets caught in the middle of a feud between Athena and Artemis over a new demigod's loyalty. For example, the new demigod shows great skills in both wisdom (Athena's domain) and hunting (Artemis's domain), and the two goddesses start to compete for the demigod's allegiance, with Percy trying to keep the peace.