Who are the main characters in 'Harry is a Swordmaster' fanfiction?

Since I don't know the specific 'swordmaster story', it could have a swordmaster as the main character, perhaps named something like Ryker. There might also be a sidekick, like a young boy who wants to learn from the swordmaster.

Jian Wushuang, the main character of the Myriad Daos Swordmaster, had seven wives. They were Sikong Chuyu, Qing Ji, Yang Lei, Xue Xi, Mandela, Lin Xuan 'er, and Jing Yun.

The main character is, of course, the Nine Heavens Swordmaster himself. He is a highly skilled swordsman with a mysterious past.

Typically, in a 'academy's genius swordmaster novel', the main character would be the genius swordmaster himself. There might also be a wise mentor figure who guides him in his swordsmanship journey. And of course, there would be other students in the academy who could be his friends, rivals, or both. For example, there could be a rival who is jealous of the swordmaster's talent and constantly tries to outdo him, and a friend who supports him through difficult times.

Since I haven't read it, I can't say for sure. But there's probably the genius swordmaster as a main character.

The youngest son, of course, is a main character. He is the central figure around which the story revolves.

The central character is the youngest son. In addition to that, there could be friends he makes along the way. These friends might be from different backgrounds, some with their own skills in swordsmanship or other areas. His parents, especially his father as a swordmaster, would have a major influence on his life and development. And there may be an old sage or a powerful swordmaster in the community who becomes involved in the youngest son's story.

The old man is the key character. Besides him, there could be a group of villagers from the backwater area. They might have different attitudes towards the old man's pursuit. Some may support him wholeheartedly, while others may think he is just daydreaming. And then there may be some antagonists, like bandits or other sword - wielding foes who test the old man's skills as he rises to become a swordmaster.

One interesting plotline could be Harry's journey to master different sword techniques. Maybe he discovers ancient sword-fighting styles and has to train hard to master them, facing challenges like difficult instructors or scarce resources.

The main character is Harry, given his immortality is the focus. Ron and Hermione are likely to be main characters too as they are integral to Harry's story. But it's also possible that descendants of other characters become important. For example, if Ginny and Harry had a relationship in the original story, their descendants could have a role. Additionally, there might be ancient magical beings that become part of the story due to Harry's immortality and his new connections to the deeper mysteries of the wizarding world.