Perhaps Peater Pan's Daughter is on a mission to retrieve a magical item that has been stolen by the pirates led by Harry Hook. She infiltrates their ship and tries to steal it back, but Harry Hook catches her. Instead of punishing her immediately, he becomes intrigued by her. As they interact more, they realize they have more in common than they thought, and a relationship begins to form between them. This could involve a lot of adventure, like exploring hidden caves in Neverland and having to work together to defeat magical guardians of the caves.
There could be many such fanfics out there. However, without more specific details about what you're looking for in this fanfic (like the genre, whether it's a romantic or adventure - based story, etc.), it's difficult to recommend a particular one. Some fanfics might focus on their relationship development, while others could be part of a bigger adventure in Neverland. You really need to dig into the relevant fanfic communities to find the best one for you.
One possible plot could be that Harry Hook, who is used to his life in the Isle of the Lost, gets magically transported to Neverland. There, he meets Peter Pan. At first, they are at odds, as Harry is used to a more villainous lifestyle and Peter is the protector of Neverland. But as they face some common threats, like a new dark force that is trying to take over both their worlds, they start to work together. Along the way, they learn from each other's strengths and weaknesses, and in the end, they become friends and manage to defeat the threat.
There are several places you can look for 'Peater Pan meets Harry Hook' fanfics. One option is Archive of Our Own (AO3). It has a vast collection of fan - created works, and you can use the search function to specifically find stories related to these two characters. Another place could be FanFiction.net, though the quality and quantity might vary. You can also check out some Tumblr blogs dedicated to Descendants or Peter Pan fandoms as some fans might share or recommend such fanfics there.
It could be about the daughter's adventures in Neverland. Maybe she tries to change the way pirates are seen there.
The plot could center around her unique abilities. Since she's Peter Pan's daughter, she might have some special powers like flying or the ability to communicate with the fairies better than anyone else. The story could be about how she uses these powers to protect Neverland from a new threat that even Peter Pan couldn't handle on his own. She might also struggle with the responsibility that comes with such great power and the expectations of living up to her father's name.
Obviously, Captain Hook's daughter would be a main character. And Captain Hook himself would play a significant role as well.
The plot could involve the kidnapped character having some sort of special power or knowledge that Harry Hook wants. So he kidnaps them to use it for his own gain. However, the character might be more resourceful than he thought. They could start to turn his own crew against him, creating a lot of drama and action within the fanfiction.
Maybe they live together as part of a witness protection - like situation in the wizarding world. Some powerful and dangerous wizard is after them, so they have to stay together in a hidden, magically protected house. They learn to live with each other's quirks, like Harry's impulsive heroics and Hermione's strict study schedules, and in the process, they strengthen their friendship even more.
One possible plot could be that Harry and Daphne start living together due to some sort of special arrangement. Maybe they are on a secret mission together and need to stay in the same place to keep an eye on things. As they live together, they gradually learn about each other's habits and personalities. Harry might discover Daphne's love for a particular type of magic or her unique skills in potion - making. And Daphne could find out more about Harry's past traumas and his true nature as a hero. They could start off as just roommates but slowly develop a deep friendship or even more as they face various challenges together.
Well, it could be about her discovering her powers. Maybe she has a natural affinity for magic related to Hecate, like powerful divination skills. She could struggle to fit in at Hogwarts as her powers are a bit different from the norm. And she might face some challenges from those who are suspicious of her because of her unique heritage.