I don't know for sure as I haven't read it. But most likely there is the player himself who is the central character. There might also be friends or foes he interacts with who play important roles in either trying to uncover his past or helping him keep it hidden.
Since I don't have in - depth knowledge of this light novel, it could be that the 'player' has a dark or complicated past. Maybe he was involved in some sort of scandal or had a difficult upbringing. The story might show how his past affects his current actions and relationships within the context of the light novel's world, whether it's a virtual game world or some other fictional setting.
Maybe he has some dark secrets in his past that he doesn't want to be known. For example, he might have been involved in something illegal or unethical that could damage his reputation in the world of the web novel.
It can create suspense. Readers will be curious about what he is hiding and keep reading to find out. For example, it might be revealed gradually through flashbacks or other characters' investigations, which adds an element of mystery to the story.
Maybe he is ashamed of it. Some past works might not be up to his current standards, or perhaps there are elements in the novel that he doesn't want to be associated with anymore.
On the other hand, Sasuke could be worried. He may think that Naruto is in some kind of trouble or danger. Given their history and the care they have for each other in the SasuNaru dynamic, Sasuke's concern could lead him to be more protective. He might start investigating the situation on his own to figure out why Naruto is hiding his face and ensure his safety.
The player might change the title and his name associated with the novel so that it becomes difficult to trace back to him. He could also use some legal means like copyright restrictions to limit its availability if possible.
Obviously, Harry Potter is the main character as it's about him hiding his power. His friends, like Hermione Granger and Ron Weasley, are also likely to be main characters. They might be in the dark about his hidden power at first, which could create some interesting dynamics in their relationships.
Issei could be a bit nervous at first. He might worry about what his classmates will think. But if they show positive reactions, he could become more confident and start sharing more about his writing. However, if they react negatively, he may feel a bit down and might even regret that they saw it.
Wang Qinian's true identity was a hidden secret agent. At the same time, he was also Fan Xian's friend and ally. He was a member of the Pavilion of Heavenly Secrets, a mysterious organization that controlled the world's intelligence. As a member of the Pavilion of Heavenly Secrets, his mission was to collect intelligence and serve the country and its people. Wang Qinian had been secretly helping Fan Xian, providing him with important information and helping him resolve the crisis. After Fan Xian became Duke of Qing, he discovered Wang Qinian's true identity. However, he did not feel any hostility towards him. Instead, he trusted him even more. There was a deep relationship between them. In the ending of the original novel, Wang Qinian lived a happy life with his wife and daughter.