One possible plot could be that Loki, while on one of his mischievous adventures in the wizarding world of Harry Potter, stumbles upon a giant snake. Maybe he decides to use the snake to cause chaos at Hogwarts. He could use his magic to control the snake and make it attack students or disrupt classes. Harry Potter, being the hero, would then have to figure out a way to stop the snake and Loki's antics. He might seek the help of his friends and use his knowledge of magic and Parseltongue (if he still has that ability) to communicate with the snake and turn it against Loki.
Well, the fanfiction could start with the giant snake being an ancient and powerful being that has been sleeping for centuries. Loki, being Loki, accidentally wakes it up while exploring the Forbidden Forest in the Harry Potter world. The snake, now awake and angry, starts to cause destruction. Harry Potter, along with his friends like Hermione and Ron, sense the danger. They initially think it's just a normal magical beast problem, but then they realize Loki is involved. Loki might be using the snake to test the strength of the wizarding world or just for his own entertainment. Harry would need to use his skills, including his ability to face dark magic and dangerous creatures, to stop the snake and deal with Loki at the same time.
Harry Potter would likely be very cautious around Loki. Given Loki's reputation for trickery, Harry would be on his guard. When it comes to the giant snake, if Loki was controlling it, Harry might try to reason with Loki first, knowing that a direct confrontation with the snake could be dangerous. He would use his knowledge of magic and the values of the wizarding world to try and persuade Loki to stop whatever he was planning. Loki, on the other hand, would probably be amused by Harry's earnestness and might play with him a bit before revealing his true intentions regarding the snake.
Perhaps in the fanfiction, the Ministry of Magic mistakes Loki for a powerful dark wizard. They try to capture him, but Loki easily evades their attempts. Harry Potter, being curious, decides to find out who this strange wizard is on his own. When they meet, Loki is initially hostile, but as they start to talk, they realize they both have a lot in common in terms of fighting against powerful and often misunderstood forces. They then form an uneasy alliance to face a new threat that is emerging in both their worlds.
Well, perhaps Harry could use his magic skills like the Patronus charm to hold Loki at bay. Since Harry has experience dealing with dark forces, he might be able to outwit Loki's trickery.
Well, perhaps Harry Potter, in the guise of Loki, uses his trickery skills in the wizarding legal system. He could be defending those wrongly accused of using dark magic, like using his shape - shifting abilities to find evidence that others can't.
One possible plot could be that Harry starts to show Loki - like traits early on at Hogwarts. He might use his trickery to outwit his enemies, like the Malfoys. Maybe he even uses some of Loki's shape - shifting abilities in a magical way to get out of tricky situations during his adventures.
One possible plot could be that Loki, reincarnated in the Harry Potter world, is initially confused by his new surroundings. He then discovers that his powers are still there but manifest in different ways in the wizarding world. He might get involved in the fight against Voldemort, not because he's on the side of good, but because he sees an opportunity for chaos and power. Along the way, he forms unlikely alliances with some of the Hogwarts students, who are both intrigued and wary of him. And his presence might also disrupt the normal order of the wizarding world, causing new problems and solutions to emerge.
One idea could be a crossover where Fenrir from the Harry Potter universe somehow gets transported to the realm of Loki. Loki, being the trickster, might see Fenrir as a tool for his own schemes. Harry Potter, perhaps in a quest to stop some dark magic related to Fenrir, ends up following him and has to deal with Loki's antics as well.
Well, the plot could be that Harry discovers a snake in the Forbidden Forest. The snake might be a magical one with special powers. Maybe it can communicate with Harry in Parseltongue and help him find hidden secrets in Hogwarts. For example, it could lead him to a long - forgotten chamber that holds ancient magic spells.
One possible plot could be that Harry discovers a new ability to communicate with snakes on a deeper level. Maybe he uses this to uncover a hidden secret in Hogwarts, like a secret passage that was protected by snake - based magic. The snake could lead him to an ancient artifact or some long - forgotten knowledge.
One possible plot could be that the snake is a key to unlocking an ancient prophecy. Harry discovers the snake and realizes it has markings that match an old legend. He then has to protect the snake from Voldemort who wants to use it for his own evil purposes.