Well, in Harry Potter spirit fanfiction, a common concept is the idea of the spirits of deceased characters coming back to offer guidance. Like the spirit of Sirius Black guiding Harry through some tough decisions. Also, the spirits of ancient wizards sharing long - lost spells or magical knowledge can be really engaging.
One interesting concept could be exploring the spirits of the founders of Hogwarts. For example, how their spirits might interact with modern students or influence the current state of the school. Another could be delving into the spirits of magical creatures and how they view the wizarding world from their ethereal perspective.
One interesting concept could be the idea of a character seeking vengeance for a wrong done to them within the magical world of Harry Potter. For example, a character whose family was killed by Death Eaters might take on a spirit of vengeance. This could lead to them going against the normal rules and ethics of the wizarding world in their pursuit of justice.
Another concept is that the wand spirit can influence the wizard's magic in unique ways. It might enhance certain spells based on the wand spirit's own nature. Like if the wand spirit has a fiery nature, it could make fire - based spells more powerful and also add a special 'flavor' to them, such as a different color or intensity.
One interesting concept could be exploring more about the Marauders' time at Hogwarts. Fanfiction might expand on their adventures, like pranks they played that were never mentioned in the original book. Another could be different interpretations of Sirius Black's escape and his relationship with Harry during that time.
Some fanfictions in Harry Potter 2 might play with the idea of the basilisk having different powers or weaknesses. It could also explore the idea of a hidden connection between Ginny and the Chamber of Secrets that goes beyond what was in the original story. There might be fanfictions that change the role of certain characters, like making Neville a more central figure in solving the mystery of the Chamber.
One interesting concept could be exploring new magical creatures in the Harry Potter kingdom. Maybe there are some hidden species that haven't been discovered in the original series. Another could be alternative forms of magic that are unique to the fanfiction's version of the kingdom. And also, new relationships between different houses or characters can be quite fascinating.
One interesting concept could be the use of magic in relation to physical laws. For example, how spells might interact with gravity. Maybe a levitation spell actually counteracts the force of gravity in a way that can be explained through some made - up 'physics' in the fanfiction.
Well, some fanfictions play with the idea of blood magic in relation to family bonds. They might show how the blood of one's ancestors can be a source of hidden power or knowledge. For instance, a character discovers that their long - lost relative had a special blood - related spell that can only be activated by someone with their exact bloodline. It adds an element of mystery and heritage to the story.
One interesting concept could be the merging of the magical world of Harry Potter with the demon - slaying elements of Sparda. For example, a character from the Harry Potter universe might gain the power of Sparda and use it to fight dark wizards in a new and unique way. It could also involve crossovers where characters from both worlds interact, leading to unexpected alliances and conflicts.
One interesting concept could be the way animism is incorporated into the magical creatures. For example, how they might have their own spirits or consciousness that is more in - depth than what's shown in the original series. Maybe the hippogriffs have a collective spirit that influences their behavior towards wizards.
Another concept could be the inflation of Hogwarts itself. The castle growing larger and larger, with new and strange rooms and corridors appearing. This could lead to new mysteries for the students to solve, like finding a hidden chamber in the newly - inflated part of the castle that holds a powerful magical artifact.