Since I don't know the exact 'the wanderer ghost story', it could be the wanderer itself, the ghost that is the focus of the story.
Perhaps there are multiple main characters. The wanderer and the person or group of people who are trying to either help it find peace or are being haunted by it. For example, a psychic who tries to communicate with the wanderer and the wanderer itself could both be main characters in the story.
The main character in the 'dark wanderer story' is the dark wanderer himself/herself.
Well, generally speaking, in a 'the wanderer ghost story', it could revolve around a figure known as the wanderer. This could be a ghost that haunts certain areas, like an old mansion or a desolate forest. Maybe it's the story of a person who died in a tragic way and is now doomed to wander the earth, and the story might detail the encounters people have had with this ghostly wanderer, the strange noises or apparitions they've witnessed.
Since I don't have the actual fanfic in front of me, it's hard to say exactly. But it could be an original character created by the author who is a lone wanderer in the Naruto world.
The main character is probably the wanderer. But other possible main characters could be those who are somehow related to the wanderer's past, like a family member or an old acquaintance who he is trying to find or get away from. There could also be characters in the present during his wandering journey, such as a fellow traveler who shares part of the journey with him and has a different perspective on life. This fellow traveler could influence the wanderer's decisions or help him see things in a new light. Additionally, there might be antagonists in the story, perhaps people who try to stop the wanderer from achieving his goals during his travels.
The main character is surely the brave wanderer. There might be other characters like a villain who had the wanderer in captivity in the first place. And then there could be side characters, such as people the wanderer meets on their journey, either before or after being freed. These side characters could help shape the story and the wanderer's development.
Since I don't know which 'wanderer novel' you are referring to, I can't say for sure. But it could be a lone wanderer as the main character, someone with a mysterious past.
Since I don't have detailed information about this specific story, I can't name the main characters. But usually in a story, the main characters are those who drive the plot forward in relation to the central theme, in this case, the end of desire.
In the Ghost Rider story, the main character is often a man who has made a deal with the devil, like Johnny Blaze. He then becomes the Ghost Rider, a being with a flaming skull and amazing powers. He's the one who rides the motorcycle and battles evil.
Oiwa is the main character. After being treated terribly by her husband, she becomes a ghost. Her story is centered around her misfortunes and her subsequent revenge as a spirit.
Since I don't know the exact story, it could be the navigator himself. He would be the central figure as the story is named after his ghost.