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.
To write a good 'Percy Jackson and OC Love' fanfiction, you should focus on making the OC fit into the story. She should have a reason to be in the world of Percy Jackson. Her relationship with Percy should start from a believable point. Maybe they start as friends and then feelings develop. Also, use the existing mythology in the series. Incorporate Greek gods and their stories into the plot. This will make the fanfiction more immersive. And don't forget to add some action and drama to keep the readers interested.
I highly recommend 'The Outcast Demigod'. This fanfiction features an OC who doesn't fit in at first. The author does a wonderful job of showing the OC's struggle to find their place among the other demigods. It has some really intense battle scenes and a lot of heart - warming moments as the OC forms friendships. The story also delves into the OC's backstory in a very interesting way, making it a great piece of fanfiction.
A child of Poseidon might be an exciting choice. Given Percy Jackson's own connection to Poseidon, there are already a lot of story elements to play with. The OC and the Poseidon demigod could bond over their connection to the water, whether it's through surfing or exploring underwater caves. Their love could be as deep and powerful as the ocean, but they also have to deal with the politics among the different cabins at Camp Half - Blood.
For beginners, 'A New Beginning at Camp Half - Blood' is a good choice. It has a simple yet engaging plot. The OC is easy to understand and relate to. The story doesn't have overly complicated mythological references that might confuse new readers. It focuses more on the OC's journey of discovery at the camp.
Another ability could be 'Inventory Management'. The OC can access a virtual inventory like in a role - playing game. They can store items in it, and when needed, pull out useful things such as magical weapons or potions. It's like having a portable storage space that only they can access, which gives them an edge in battles and quests.
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.
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.