One idea could be that Percy and Clarisse are forced to team up on a quest outside of Camp Half - Blood. At first, they bicker constantly like they used to, but as they face various challenges, they start to see each other's strengths. For example, Percy realizes Clarisse's battle skills are invaluable in a fight against a group of powerful monsters. They gradually become friends and learn to respect each other more than ever before.
Maybe Clarisse has her own reasons. She might see Percy as someone who needs protection in the complex world of the fanfiction setting. It could be that she has a soft spot for him deep down, or she feels a sense of responsibility towards him for some unspoken events in the story.
Their relationship could develop as comrades. They might start off disliking each other but as they face challenges together, like battling powerful foes or solving mysteries in the demigod world, they learn to tolerate and then respect one another. It's a development based on mutual respect for each other's abilities.
Percy could react by ignoring Clarisse at first. He might think that if he doesn't give her a reaction, she will stop. But when that doesn't work, he could start to fight back verbally, using his quick thinking to come up with comebacks.
One main theme is rivalry - turned - friendship. They start off as rivals but often in fanfics, they come to respect and befriend each other. For example, in many stories, they learn to see past their initial differences.
One common theme is rivalry -turned - friendship. They start off not liking each other much in the original stories, so many fanfictions explore how they can move past that initial animosity. For example, they might be paired on a mission and slowly realize they have more in common than they thought.
The fanfic could start with Percy and Clarisse being chosen for a secret mission. They had to infiltrate a Titan - held fortress. On their journey, they faced many challenges. Percy's ability to communicate with sea creatures helped them cross a large river, while Clarisse's strength was crucial in breaking through some barricades. Along the way, they shared stories of their pasts, their insecurities and dreams. By the time they reached the fortress, they had a deep bond. They managed to complete the mission, and this experience changed their relationship forever.
I really like 'Clarisse and the Quest for Honor'. In this fanfiction, Clarisse goes on a solo quest that challenges her in ways she never expected. It's full of action and also some really interesting interactions with minor characters from the Percy Jackson universe that you don't often see in the main series.
A theme that frequently appears is the exploration of their individual growth. Clarisse may learn to be more understanding, and Percy might gain more respect for Clarisse's abilities. Also, the theme of redemption can be seen. If they've made mistakes in the past, fanfictions sometimes show them making up for it through their actions together. And there's also the theme of mutual respect. As they get to know each other better, they start to respect each other's skills and personalities more.
A really good 'Percy Jackson x Clarisse Fanfiction' is 'When Percy and Clarisse Train Together'. In this one, they are forced to train together and through the process, they discover new things about each other. They start to respect each other more and it's a great read for those who like character - development - focused stories.