Well, the OC could be a daughter of a minor god. Percy first meets her when she's in trouble in the mortal world. He saves her and brings her to Camp Half - Blood. As she tries to fit in, Percy helps her a lot. Their love story could develop as they discover secrets about her parentage together and find out that they are fated to be together in some way, like they are part of an old prophecy.
One possible plot could be that the OC is a new camper at Camp Half - Blood. They meet a demigod from a different cabin during a training session. The two initially clash due to different fighting styles, but as they are forced to team up on a quest, they start to see each other's strengths and fall in love. For example, the OC might be a child of Aphrodite who is more into charm and persuasion, while the other demigod is a son of Ares, focused on brute force.
A cool plot could be that on Percy's birthday, the gods decide to grant him a special wish. But there's a catch - he has to complete a mini - quest first. So Percy, along with his closest friends, embarks on this quest that takes them to a mysterious island. On the island, they face various challenges, like fighting off strange monsters. When they finally succeed, Percy gets his wish, which could be something like ensuring the safety of all his friends at Camp Half - Blood forever.
A good plot for a female OC in Percy Jackson fanfiction could involve her on a quest to discover her true identity. She might start off thinking she's just an ordinary girl, but then strange things start to happen, leading her to Camp Half - Blood.
Another plot could be that Percy and Clarisse are trapped in a parallel dimension. In this dimension, the rules of Camp Half - Blood are different, and they are considered outcasts. They have to find a way to get back to their own dimension. Along the way, they meet strange versions of their friends and enemies. They rely on each other's unique skills. Percy uses his wits to figure out the strange magic at work in this dimension, while Clarisse uses her courage to face the dangerous creatures. As they work together, they grow closer and finally find a way back home, with a much - improved relationship.
One idea could be that the OC is a new camper at Camp Half - Blood. She has a special power that Percy is intrigued by. They start off as friends, helping each other in various quests. As time goes on, they realize their feelings for each other during a particularly dangerous quest where they have to rely on each other completely.
Well, in this fanfiction, Percy as the God of Love might have a love - triangle situation of his own. Maybe he's in love with Annabeth still, but as the God of Love, he has some sort of divine connection with a new character, like a nymph. And he has to figure out how to balance his mortal love and his new divine love - related responsibilities.
One possible plot could be that Percy somehow ends up in the Twilight world. He meets Bella and they initially clash because of their different personalities and backgrounds. But as they face common threats, like a new type of monster that combines the elements of Greek mythology and the Twilight creatures, they start to fall in love.
The plot could involve the OC struggling with the reputation that comes with being the son of Dionysus. In the Percy Jackson world, Dionysus is often seen as a bit of a party - god and not always taken seriously. So the OC might have to constantly prove himself to his fellow demigods. He could start out being underestimated but then prove his worth in a quest, like finding a lost magical item that only someone with his connection to Dionysus' powers could locate.
One great 'Percy Jackson and OC Love' fanfiction is 'Love in Camp Half - Blood'. It has a really interesting plot where the OC has unique powers and her relationship with Percy develops in a very engaging way. The author does a wonderful job of integrating the OC into the existing Percy Jackson world.
In a 'Percy Jackson and a OC love fanfiction', you could also use the element of sacrifice. Let's say the OC is in danger of being captured by a powerful enemy. Percy risks everything to save her. This act of selflessness makes the OC see Percy in a new light. On the other hand, the OC could also sacrifice something for Percy, like giving up a chance to go back to her old life in order to stay with him at Camp Half - Blood. These sacrifices deepen their connection and lead to a stronger, more loving relationship.