Hermione Granger is also a likely main character. Fanfiction writers might want to explore her potential as a fighter. She has the intelligence to quickly learn new fighting techniques and could use her vast knowledge of magic in combat situations.
Harry Potter himself is often a main character. Given the title 'Master Fighter', he could be portrayed as having extraordinary combat skills, perhaps through some new form of training or a hidden magical ability.
Well, aside from the obvious ones like Harry and Hermione, Luna Lovegood can be a main character in some 'Harry Potter Master Legilimency' fanfictions. Her unique perspective on magic could lead to some interesting takes on Legilimency. Sirius Black is also a character that might be involved. He was a member of the Marauders and could have passed on some knowledge about Legilimency. And then there's Dumbledore. Given his vast knowledge and power, he could be guiding the main characters in their Legilimency studies or using it in his grand plans for the wizarding world.
Hermione is often a main character in these fanfictions. Given her love for learning and thirst for knowledge, it's easy to imagine her exploring the intersection of science and magic.
Obviously, Harry Potter himself is the central character as 'Lord Potter'. Then there are his friends like Hermione and Ron. In some fanfictions, they play different roles. Hermione might be more involved in researching the Potter family history and helping Harry understand his new title, while Ron could be by his side in battles, using his Weasley family's unique skills.
The main character is Harry Potter without a doubt. However, new characters can also be introduced in these fanfictions. For example, there could be a local wizard or witch in the place where Harry is exiled who becomes his friend or mentor. This new character can have their own backstory and motives. They could teach Harry about the local magic or help him adapt to his new environment, adding a new dimension to the story.
Often, Harry Potter himself can be a main character in these fanfictions. He might be the one to encounter the wraith and try to figure out its motives and how to deal with it, using his skills and knowledge of magic.
Harry Potter himself is often a main character. Since he's the hero of the original series, it's natural for him to be the 'genius gamer' in these fanfictions. He could use his gaming knowledge to solve magical problems.
Harry Potter himself is often a main character in these fanfictions. As he already has a natural inclination towards facing challenges and has a connection to powerful magic, it's easy to imagine him as a Dragonlord. He could use his newfound power to fight Voldemort in different and more powerful ways.
In some fanfictions, the 'Master Fighter' concept might be applied to the Marauders. They could be part of a secret dueling club in Hogwarts, and their adventures in mastering different fighting styles could be explored. It could also show how their skills influenced the later generations at Hogwarts, like Harry and his friends.
Another character that might be involved is Bellatrix Lestrange. As a devout follower of Voldemort and a member of the Black family, she could have complex relationships with Lady Black. Maybe in some fanfictions, Lady Black has to deal with Bellatrix's extreme actions and how they reflect on the family name.
Hermione could also be a main character. She is known for her intelligence and research skills. In a fanfiction, she could be the one researching the history of the snake staff, trying to understand its true nature and powers, and using her knowledge to either protect it from falling into the wrong hands or to unlock its potential for good.