One idea could be Percy discovering his connection to Hera later in his adventures and having to deal with the reactions of his friends. Another could be him having unique powers inherited from Hera that set him apart from other demigods.
Perhaps Percy as the son of Hera could be involved in a prophecy that only he can fulfill due to his heritage. This could lead to a journey where he has to seek out ancient artifacts or allies related to Hera. He might also face opposition from other gods who are jealous or fearful of his new - found status.
A cool plot could be Percy being sent on a mission by Hera to restore balance in a part of the world that has been disrupted by a powerful and evil force. Along the way, he meets other demigods who are initially skeptical of him because of his relation to Hera, but they eventually come to respect and support him as they see his courage and determination.
Well, Percy could be sent on a quest by Hera to reunite broken families in the mortal world. This would be in line with Hera's role as the goddess of family. As he does this, he could encounter various monsters and challenges. Along the way, he might discover that some of these broken families are the result of the interference of other gods or mythical beings. Percy would then have to use his wits and powers (as the son of Hera) to not only fix the families but also deal with the root causes of their problems. This could involve battles, negotiations, and a lot of self - discovery for Percy.
One plot idea could be Percy having to team up with Hera to rescue a group of demigods who have been captured by an ancient monster. Hera, despite her usual aloofness, realizes she needs Percy's unique skills.
A plot could involve Hera taking Percy on a journey through the past to show him the origins of the gods' power and how it relates to the current problems in the demigod world. This would give Percy a new perspective and knowledge that he can use to save the day. Or perhaps Percy accidentally stumbles upon a secret of Hera's that she's been hiding for centuries, and she has to enlist his help to keep it safe, all while other gods are trying to uncover it too.
One plot idea could be Hera going on a quest with Percy. Since she's a goddess and Percy is a demigod, their dynamic would be really interesting. They could face challenges that test both Hera's divine powers and Percy's wits as a hero. Another idea is a story where Hera loses her memory and Percy has to help her remember who she is while protecting her from other threats in the demigod world. Maybe some monsters would see her in a weakened state as an easy target.
One idea could be Percy struggling to fit into Hera's world. Since Hera is known for her complex nature, Percy might constantly be in a battle of wills with her. For example, Hera could try to mold Percy into a more 'proper' hero according to her standards, which clashes with Percy's own free - spirited way of being a hero. Another plot could involve Percy's relationships with other demigods changing. They might be jealous or suspicious of his new status as Hera's adopted son, leading to some interesting conflicts and rivalries within the demigod community.
One plot idea could be that Percy has to deal with the internal conflict of having two very different divine parents. Hera's strict and often - conniving nature clashes with Poseidon's more laid - back and powerful - but - less - controlling side. Another could be that the other demigods at Camp Half - Blood are initially distrustful of him because of Hera's reputation. So Percy has to prove himself not only as a powerful demigod but also as someone who can be trusted.
The plot could revolve around Percy's relationship with his divine parents. Since Zeus and Hera have a complex relationship themselves, Percy might struggle with their expectations. Maybe he's caught in the middle of a power struggle between Zeus and Hera's different ideas of how he should use his powers. He could also be trying to unite the camps of different god - related demigods under his leadership as the son of two major gods.
A more complex plot could be that Hera, in an attempt to make amends for her past actions against demigods, chooses Percy to be her champion in a tournament among the gods' champions. This would put Percy in a very difficult position as he has to face off against other powerful demigods representing different gods. Through this process, Hera and Percy form an unlikely bond as she guides him through the political and dangerous world of godly competitions.
One idea could be Percy having to face a series of trials specifically designed by Hera to prove his worth as her champion. For example, he might have to navigate a maze filled with illusions based on Hera's past grudges.
Well, perhaps in the fanfic, Percy is wrongly accused of a crime by Zeus. He then has to go on the run, all the while trying to clear his name. Along the way, he teams up with some unlikely allies, like a group of nymphs who have their own reasons for helping him. As he's on the run, he uncovers a conspiracy within the Olympian council that could change the fate of the demigod world forever.