Yes, there are quite a few. You can find them on fanfiction websites like FanFiction.net or Archive of Our Own. Some explore really interesting scenarios where Harry befriends Peeves and they get into all sorts of magical mischief together.
One common theme is the idea of an outsider friendship. Both Harry and Peeves are a bit of outsiders in different ways. Harry is the Boy Who Lived and has a lot of expectations on him, while Peeves is a poltergeist not fully accepted by the Hogwarts community.
In a 'Harry Potter' fanfiction where Peeves is a lawyer, the courtroom would be a very different place. Peeves would bring his own brand of humor and mischief. He could use spells and charms in creative ways to present evidence or cross - examine witnesses. His clients would probably be other magical creatures or misfits in the wizarding world. He might use his poltergeist powers to intimidate the opposition or to create distractions when things aren't going his way. It would be a wild ride of a fanfiction, full of magic, mayhem, and Peeves' unique antics.
I'm not sure there are a ton of 'Harry Potter' fanfictions specifically with Peeves as a lawyer, but you could try searching on fanfiction.net or Archive of Our Own. You might have to dig through a lot of stories to find one that fits this rather unique concept.
One common theme is the clash of personalities. Hermione is studious and rule - abiding while Peeves is mischievous. Another theme is the idea of Hermione trying to reform Peeves. And often there's the theme of unexpected friendship that might develop between them.
Peeves is a poltergeist in the Harry Potter series. His origin isn't fully detailed in the books. However, it's known that he has been at Hogwarts for a very long time, causing mischief long before the main characters arrived. He seems to be a part of the magical fabric of the school, popping up here and there to play pranks on students and staff alike.
One great Hermione and Peeves fanfiction is 'The Mischief of Magic'. It has a really interesting plot where Hermione tries to outwit Peeves in a series of magical challenges within Hogwarts. Another one could be 'Peeves' Pranks and Hermione's Plans' which shows their interactions in a very humorous way. And there's also 'Hermione's Encounter with Peeves' which delves into how Hermione uses her intelligence to deal with Peeves' constant trouble - making.
Yes, there are quite a few. Some fanfictions explore Harry forming friendships with Slytherins in unique ways. For example, in some stories, they bond over shared interests in potions or a mutual understanding of the pressure they face at Hogwarts. These friendships often lead to new alliances and help break down the traditional house rivalries.
It could be that he is wrongly perceived as dangerous. After all, he has survived the Killing Curse as a baby and Voldemort is always after him. People might be afraid to get close to him for fear of getting caught up in the dark wizard's wrath.
One of his friends could be a young werewolf who is struggling to control his condition. Harry, having faced his own challenges, would befriend him and help him find a way to live a more normal life in the wizarding world.