One interesting storyline could be about a new and rare magical creature being discovered in the Magical Menagerie. The main character, perhaps a young wizard or witch, tries to protect this creature from dark wizards who want to use it for evil purposes.
There could also be a fanfiction where the magical animals start to rebel against the wizards. Maybe they feel exploited or mistreated. This would lead to a big conflict in the wizarding world. The wizards would have to find a way to make peace with the animals. Some wizards might side with the animals, creating a divide within the wizarding community. It would be a really exciting and different take on the Harry Potter and magical animals concept.
One interesting storyline could be about creating a new magical block that has the power to transport wizards to different eras in the wizarding world. For example, it might take them back to the time of the founders of Hogwarts, allowing them to witness the creation of the school and learn ancient magic that has been lost over time.
Often, Hagrid appears in these fanfictions. Given his love for magical creatures, he's a natural fit. He might be helping out at the Magical Menagerie or sharing his knowledge about the creatures with the younger characters.
In Harry Potter fanfiction, one interesting magical power could be the ability to time - travel without a Time - Turner. This allows characters to go back and change key events in the wizarding world's history. Another could be elemental control, like being able to manipulate fire, water, air, and earth in ways not seen in the original books. And some fanfictions might feature the power of mind - reading on a much larger scale, being able to access the thoughts of not just individuals but entire groups at once.
One interesting magical item in Harry Potter fanfiction could be a time - turning amulet. It allows the wearer to go back in time for short periods, creating all sorts of plot twists. Another might be a spell - binding quill that can write out spells automatically. And there could be a magical cloak that not only makes you invisible but also can teleport you short distances.
One interesting magical creature often seen in Harry Potter fanfiction is the Thestral. Since it can only be seen by those who have witnessed death, it adds a dark and mysterious element. Another could be the Nundu, a large and dangerous cat - like creature. It's powerful and feared, which makes for great plot twists in fanfictions. And the Phoenix is also a popular one. Its ability to be reborn from ashes can symbolize hope and renewal in fan - created stories.
One interesting storyline could be about alternate versions of the Triwizard Tournament. Maybe in the fanfiction, the tasks are even more dangerous and creative, with different characters getting involved in unexpected ways. For example, Neville could be a surprise champion and show his hidden talents during the tasks.
In some fanfictions, Alexstrasza could be a hidden protector of Hogwarts. Since she is a very powerful being, she might have been secretly watching over the school for centuries. When Harry arrives, she reveals herself and offers her assistance, especially in dealing with the dark creatures that lurk around the school and are allied with Voldemort.
Another storyline might involve an Ogron having a unique magical ability that Harry Potter discovers and uses to their advantage. For example, the Ogron could be able to communicate with a certain type of magical creature that holds the key to a powerful spell or a hidden treasure. This would lead Harry and his friends on an exciting adventure to find and utilize this newfound power.
One interesting storyline could be about an alternative Hogwarts where the houses are not sorted by the traditional Sorting Hat method. Another might be a fanfiction game story where a new, powerful magic is discovered within the Forbidden Forest. And then there's the idea of a story where Muggle - born students form a secret society to protect themselves from pure - blood bullies.