A magical creature that has the ability to speak and befriend Harry would be a great addition. For instance, a phoenix - like creature that is not as well - known as Fawkes. It could offer Harry advice and help him in the Triwizard Tournament, and their friendship would be a heartwarming aspect of the story.
A young wizard from a far - flung magical community that has different magic traditions. He could be a bit of an outcast at Hogwarts because his magic is so different, but his unique skills could come in handy during the Triwizard Tournament. For example, he might use a type of magic that involves communicating with plants to get through a task.
A character who is a descendant of the original maker of the Elder Wand. They might have an innate connection to the wand and possess knowledge about its secrets that no one else does.
A time - traveling wizard from a far - off future in the magical empire. This character could bring knowledge of advanced magic that has not been discovered yet in the current time of the Harry Potter universe. They might be on a mission to prevent a future disaster from occurring in the past, but their actions could have unforeseen consequences on the present - day magical empire.
A new character could be a foreign exchange student from a far - off wizarding school. This student could bring with them unique magical abilities that are not commonly seen at Hogwarts. For instance, they might be able to control the elements in a way that is different from any known Hogwarts magic. They could also have a different perspective on the fight against Voldemort, which could influence Harry and his friends.
A young auror - in - training who is sent to Hogwarts to keep an eye on things. They could befriend Harry and the gang, and offer some insights into the wider wizarding world and the fight against Voldemort. Plus, they could have some interesting backstories and motives.
An old ex - Auror who now lives near Hogwarts. He could have a past connection to Voldemort and some knowledge about the Dark Arts used in the Triwizard Tournament. He becomes an unofficial mentor to Harry, teaching him some unique spells and strategies that are not part of the regular Hogwarts curriculum. This character could bring a new perspective and a bit of wisdom to the story.
There are also new teachers or mentors in some fanfics. A former Auror who comes to Hogwarts to train the students in combat magic. This character might have a dark past that is slowly revealed as the story progresses, making them a complex and interesting addition to the 7th year story.
A young Auror who is assigned to help guard Azkaban but has a secret sympathy for the prisoners. This character could add a new dynamic to the story as they struggle between their duty and their conscience.
Hermione is also a favorite. In fanfiction, she can be shown delving even deeper into her studies, perhaps uncovering secrets about the wizarding world's history that are relevant to the 6th year events. Also, her relationship with Ron and how she deals with her own feelings and insecurities is a popular theme. Ginny is another popular character. Fanfictions might focus on her as a powerful witch in her own right during Harry's 6th year, showing her skills on the Quidditch pitch and her influence among the students.
Harry Potter himself is always popular. In 5th - year fanfiction, readers often like to see his growth and how he copes with the various challenges. Hermione is also a favorite. Her intelligence and loyalty make her an interesting character to explore further in fan - created stories.