It could be that revealing his past would put him or someone else in danger. Or perhaps it's just too embarrassing for him to share.
Maybe he's afraid of being judged or has something to protect.
The player might change his identity or keep silent about his past. Simple as that.
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.
The player might hide his past because it could affect his current relationships or status in the story. Maybe it's related to a mistake he made and he's afraid of being judged.
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.
It reveals the past gradually through plot developments and character interactions, keeping readers engaged and curious.
The story might revolve around the player's efforts to keep his past a secret while facing various challenges and interactions in the present.
Naruto might hide his feelings because he doesn't want to burden others. He has been through a lot in his life, like being an orphan and facing discrimination in the village. He may think that sharing his negative feelings, such as loneliness or self - doubt, will make others worry about him. So, he chooses to keep them to himself and always show a positive, determined side to the people around him.
To gain an advantage. Just like in the original series where he often used surprise to his benefit. In fanfiction, hiding his power allows him to do the same. He can catch his opponents off - guard.
One possible reason could be for protection. Maybe there are threats out there targeting him, so by hiding his appearance, he can move around more freely without being recognized. For example, if there are rogue ninja who want to take revenge on him for past battles, hiding his face would make it difficult for them to track him down.