Some Tumblr blogs dedicated to the fandom might have fanfic recs. Look for blogs that focus on the relationship between Percy and Nico. They might post links to or reviews of fanfictions where Percy is overprotective of Nico. You can also ask the bloggers directly if they know of any good ones.
One place to start looking could be Archive of Our Own (AO3). Just search for 'percy is overprotective of nico' in their search bar, and you'll likely find a good number of relevant fanfictions.
Fanfiction.net might also have some. However, the tagging system there isn't as refined as AO3. You might need to do a bit more digging around by using different search terms related to Percy's overprotectiveness towards Nico. For example, try 'Percy Nico protect' as well to see if you can find more options.
One common theme is friendship. Percy's overprotectiveness can be seen as an extreme form of his friendship with Nico. He wants to keep Nico safe from the various threats in their world, which shows how much he values their bond.
Nico might initially be frustrated. He wants to prove himself and show that he can take care of himself, but Hades' overprotectiveness holds him back.
Maybe she sees Percy as a younger brother she needs to protect. She might have a sense of responsibility towards him.
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.
Well, it could be that in the context of the fanfiction, Clarise has a deep understanding of the threats Percy faces. She may have witnessed some near - misses or had premonitions about his safety. So, she becomes overprotective to prevent any harm from coming to him. Also, it could be related to some unspoken bond or connection they share within the story's unique plot.
The camp leaders might betray them. If there is a power struggle within the camp, and Percy and Nico are seen as threats to the current leadership's power, the leaders could set them up. They could make it look like Percy and Nico are breaking camp rules or endangering the other campers, which would lead to the rest of the camp turning against them.
Well, 'Percy's Overzealous Protection' is another great one. It explores Percy's overprotective tendencies not just towards his close friends but also towards new demigods at Camp Half - Blood. He tries to shield them from all the perils of the demigod world, and the story unfolds with his efforts causing both admiration and some exasperation among the other characters.
One common theme is friendship. Percy's overprotectiveness often stems from his deep love for his friends. For example, he doesn't want to see them get hurt during battles or dangerous quests.
Yes, there are many. You can look for ones on platforms like FanFiction.net. Just search for 'Percy and Nico friendship' and you'll find a lot of great stories that focus on their bond as friends, like adventures they might go on together or how they support each other in the face of challenges.
I really like 'Percy, Nico and Jason: Bonds Beyond Camp'. In this fanfiction, it focuses on the friendship between them. It shows how they overcome their differences and work together. There are some heart - warming scenes, like when they have to protect each other from a powerful enemy. The character development is well - written.