In many such fanfics, Percy uses his intelligence. For example, he might study the laws and regulations of the wizarding world thoroughly to find loopholes that can protect Harry from unjust punishments or accusations.
Minato might show his protectiveness by always being near Naruto in spirit. For example, he could leave behind some kind of jutsu or power that activates when Naruto is in great danger, like a hidden seal that releases a powerful defense.
One common scenario is when Percy is in danger during a battle with a powerful monster. Poseidon might send some kind of sea - based assistance, like a helpful sea creature to fight alongside Percy or create a protective barrier of water around him. Another could be when other gods or demigods try to harm Percy unjustly, and Poseidon intervenes in a more subtle way, perhaps by influencing the situation to keep Percy safe without directly showing his power.
One common scenario could be in a dangerous situation at Hogwarts, like when there's a dark magic threat. Cedric might step in front of Harry to shield him. Another could be during a Quidditch match where an opposing team is playing dirty, and Cedric ensures Harry is not targeted unfairly.
One possible reason could be that Percy has shown great courage and a pure heart. Artemis might see in him the potential to be a great ally in the fight against the forces of chaos. Maybe Percy has also done something to earn her respect, like saving one of her hunters or standing up for what's right in a situation that involved her domain.
In some fanfictions, Naruto shows his protectiveness by getting extremely angry when someone badmouths Sakura. He won't tolerate any disrespect towards her and will quickly defend her honor. He might also use his influence in the village to make sure Sakura is always safe and well - cared for.
A great 'Protective Percy of Harry' fanfic is 'Percy's Unwavering Shield'. In this fanfic, Percy is portrayed as a sort of guardian angel for Harry. He anticipates the threats against Harry before they even happen. He forges alliances within Hogwarts and outside to ensure Harry's safety. Percy's character is shown to be much more complex than in the original books, as his protective nature towards Harry brings out different sides of him, like his strategic thinking and his ability to manipulate situations to Harry's advantage.
She often uses her physical abilities. For example, she uses her shield to block attacks aimed at Percy.
She might physically stand in harm's way. For example, if there's a threat approaching Naruto, Kushina would put herself between Naruto and the danger. Just like how a mother bear protects her cub.
Maybe there's a scene where Percy is in danger from a powerful monster, and Artemis steps in to defend him. She could use her hunting skills or her divine powers to fend off the attacker.
It can also make Percy more empathetic. Since he has such a powerful and protective father, he realizes the importance of protecting others too. He may be more likely to step in and help those in need, just as Poseidon does for him. This protection also gives Percy a sense of security that allows him to explore his own identity and powers more freely. He doesn't have to constantly worry about being alone or unprotected, so he can focus on growing as a hero and as a person.