Well, it would be really interesting. Percy is a heroic character from his own series. If he were in Slytherin, he might bring a different kind of leadership. He could use his strategic thinking, which he has shown in his battles against monsters, to lead Slytherin in a new way. Maybe he would change the perception of Slytherin being all about cunning in a negative sense and show that it can also be used for good, like protecting the school in a more sly and intelligent manner.
His water - based powers could be used in unique ways. For example, he could create water barriers around Slytherin's common room for protection. His control over water could also be used in dueling practice, teaching Slytherin students new defensive and offensive techniques.
Yes, there are quite a few. You can find them on popular fanfiction platforms like FanFiction.net or Archive of Our Own. Some writers explore how Percy's character traits would interact with the Slytherin house values, creating really interesting and unique stories.
Draco Malfoy would be a likely character. Given his Slytherin status, he would likely have a complex relationship with Percy. He might start off as hostile, seeing Percy as an outsider, but then they could end up having to work together for some reason.
One interesting plotline could be Percy having to deal with the Slytherin values while still holding onto his own heroic nature from the Percy Jackson series. Maybe he has to face prejudice from some Hogwarts students who are suspicious of a 'half - blood' being the heir.
He'd probably face a lot of challenges. The Slytherin house has a reputation for being sly and ambitious, which is different from Percy's more straightforward heroism. But he might also learn to use his wits more and become more strategic.
Well, it's appealing because we get to see a different side of Snape. In the original series, we see him mainly through Harry's eyes, but in fanfiction as head of Slytherin, we can explore his leadership style. For example, he might be more understanding towards the Slytherin students' ambitions and help them channel it in positive ways.
One great Snape as Head of Slytherin fanfiction is 'The Slytherin Legacy'. It delves into how Snape shapes the Slytherin house in ways different from the original series. His strict yet fair leadership is really well - portrayed, and the interactions between him and the students are both interesting and full of the Slytherin - like intrigue.
In a fanfiction, the sick Slytherin student could be a key player in Slytherin's house politics. Snape has to balance the student's health with the power dynamics within the house. He might use the situation to teach the other Slytherin students about loyalty and taking care of their own.
Perhaps a sick Slytherin student is suspected of having a contagious magical illness. Snape would then have to take precautions to prevent the spread within the Slytherin common room and the whole school. He could be shown as using his potions knowledge to try and find a cure or at least diagnose the problem quickly.