A character with the ability to see the future clearly could be added. They would constantly be in a state of conflict, knowing what is going to happen but not always being able to change it. Also, a character who is a magical artist, able to bring their paintings to life in a more vivid and unpredictable way than the normal magic at Hogwarts.
A half - vampire student. This character could have unique abilities like super speed and enhanced senses. They could be a bit of an outcast, but also have a mysterious allure and help Harry in unexpected ways, perhaps in dealing with the Dementors.
A plot could involve a group of students starting a secret club within Hogwarts that focuses on exploring the Forbidden Forest in a more in - depth and safe way. They could discover new magical creatures and learn about their habitats. Or perhaps a fanfiction where the Sorting Hat starts to malfunction and mis - sorts students, leading to chaos and self - discovery as students have to adapt to new houses.
Some fanfics introduce a new magical creature as a character. For example, a sentient phoenix that can communicate and has its own motives during the events of the Goblet of Fire. It could befriend Harry and help him in ways that Dumbledore's phoenix, Fawkes, couldn't.
One unique feature could be a hidden compartment in the wand. This could be used to store small magical items like a vial of potion or a charm. Another feature could be a wand that changes color depending on the mood of the wielder or the type of magic being used. For example, it might turn red when using defensive spells and blue when using healing spells.
The Weasley twins, Fred and George, could be great characters to add. Their mischievous nature and love for pranks could either annoy Cornello or get him to loosen up and see the fun side of magic. They could also use their inventive magical skills to help Harry and Cornello in some tricky situations. Additionally, Luna Lovegood could be added. Her unique perspective on magic and the wizarding world might make Cornello question his own beliefs and she could also form an interesting friendship with Harry within the context of this fanfiction.
One original character could be a wizard named Aiden. He has the power of teleportation but can only do it within a certain radius. This limitation makes his power both useful and challenging. There could also be a witch named Celeste who has the power of charm - speaking, which is like a super - powered version of the Imperius Curse. She can make people do almost anything she wants just by speaking to them in a certain way. And a centaur named Brutus who has the power to read minds at a short distance could be added. He could be an ally or a source of information for Harry and his friends in the fanfiction.
Often, original characters are added. For example, a new student who has some special ability related to water or swimming. They might befriend Harry and help him in the second task, either knowingly or unknowingly.
There could be a young witch from a far - off land who has a special ability to communicate with snakes, even better than Slytherin himself. She could be added to the story to either help or hinder Harry and his friends in their battle against the basilisk.
Well, it could have different houses. Instead of the traditional Gryffindor, Slytherin, Hufflepuff and Ravenclaw, there might be houses based on new themes like magic from different cultures. For example, a house for Celtic magic, another for Asian magic etc. The curriculum would also be different. Maybe there would be more focus on practical magic for everyday life rather than just the academic magic taught at Hogwarts. And the teachers could be some really unique characters, not just wizards but perhaps magical creatures who can teach in their own special ways.
In many Harry Potter fanfictions, ginger characters often have a fiery and passionate nature. For example, they might be more likely to stand up for what they believe in. Their hair color can be seen as a symbol of their distinctiveness in the story.