A possible plotline could be that the guide dog is a gift from a muggle - born wizard to their wizard friend. The dog then helps the wizard in their daily life at Hogwarts, like finding their way around the Forbidden Forest during a class. Another plotline might be that the guide dog has a special connection to a certain magical spell or charm, and the story revolves around the characters trying to figure out this connection.
In a 'Harry Potter guide dog' fanfiction, the plotline could center around the guide dog being a key to unlocking an ancient magic. Maybe the dog's presence is foretold in an old prophecy. The characters would then have to protect the dog while also trying to understand how it relates to this powerful magic. Another idea is that the guide dog is actually a transformed wizard. Due to a curse or a powerful spell gone wrong, the wizard was turned into a dog. As the story progresses, the other characters try to find a way to reverse the transformation. This would involve exploring different spells and potions within the Harry Potter universe and could lead to all sorts of adventures and interactions with other characters.
One plotline could involve a guide dog that was once an ordinary dog but was accidentally exposed to some magic and gained special abilities. It then teams up with a group of Hogwarts students to solve a mystery that is plaguing the school. For example, the mystery could be related to the sudden disappearance of some students, and the guide dog's newfound abilities, like being able to see hidden magical marks, help in the investigation. There could also be a plotline where the guide dog is a stray that wanders into Hogwarts and forms a bond with a lonely student. This bond then becomes a source of strength for the student as they face various challenges in the wizarding world, such as dealing with bullies or difficult classes.
One possible plotline could be that Harry, after some dark magic influence or a strange accident, starts to show Joker - like behavior at Hogwarts. He might play cruel pranks on his classmates and teachers, using his magic in unexpected and unethical ways.
One possible plotline is that Broly is brought to the Harry Potter world as a result of a powerful spell gone wrong. He initially causes chaos with his strength but then gradually learns about the concept of magic and starts to respect it. Another could be that Broly is a hidden protector of Hogwarts, his Saiyan powers being the ultimate defense against a new dark force that the normal magic in the wizarding world can't handle.
A possible plotline could be that Harry uses his invisibility to spy on Voldemort's followers and gather intelligence for the Order of the Phoenix. This would add an element of mystery and danger as he has to be extremely careful not to be detected.
Maybe Aragorn is summoned to Hogwarts by a powerful spell gone wrong. Once there, he has to figure out how to get back to Middle - earth while also getting involved in the magical world's problems. He could end up teaching the students about non - magical combat skills.
A possible plotline could be that lithium is a key ingredient in a new spell that a young wizard discovers. This spell could be used to combat the dark forces in a unique way. Another plotline might be that lithium is found in a hidden part of the Forbidden Forest and it has some sort of connection to an ancient magic that was long forgotten.
One possible plotline could be that Harry Potter and his friends are magically transported to the NBA world. They then use their magic to enhance their basketball skills and compete against the best players. Another could be that NBA players visit Hogwarts and learn about magic while also teaching the students about basketball.
A plotline might involve Harry being a hidden princess all along. He discovers this truth and has to reclaim his rightful throne in the wizarding world. Along the way, he would face challenges from those who don't want him to succeed, and he would use his Harry Potter skills like magic and courage to overcome them. It could also involve a love story where he has to choose between his duty as a princess and his feelings for someone.
One possible plotline could be a Lannister student at Hogwarts. They might bring their family's ambition and power - hungry nature into the school, causing all sorts of drama among the houses. For example, trying to take over the Slytherin house leadership through manipulation.
One possible plotline could be Harry trying to hide his merman identity while at Hogwarts. He might face challenges in the magical underwater areas of the school, like the lake. Another could be that he discovers his merman heritage and has to go on a journey to learn more about it and his new powers.
Perhaps a story could be about a new character who is a kickboxing expert from the Muggle world and discovers they have magical abilities in the wizarding world. They then combine their kickboxing knowledge with magic to face various challenges. They might train with the likes of Hagrid to become even stronger in both aspects.