As the title implies, Yaya is probably a central figure. There could be a mentor figure in the graphic novel who helps Yaya on her journey. Or perhaps there's a love interest for Yaya. Another possible main character could be an antagonist who creates conflict for Yaya.
Without having read the 'Ballad of Yaya Graphic Novel', it's difficult to say precisely who the main characters are. However, based on the title, Yaya is clearly important. There may be a group of characters that Yaya is part of, and they all have their own roles to play in the story. Maybe there's a wise old character who gives Yaya advice, or a young sidekick who accompanies her on her adventures.
I'm not sure exactly as I haven't read it. But generally, a graphic novel like this might be about the story of Yaya. It could involve her adventures, relationships, or some kind of journey she undertakes. Maybe it's set in a particular world or time period.
Since I haven't read it, I can't say for sure. But given the title, Sophie is likely to be one of the main characters. There could be other characters like her friends, family members, or perhaps antagonists who play important roles in the story.
In this novel, the main character could be a former knight who has lost his way. He finds solace in wine while still relying on his sword skills. There might be a group of bandits as antagonists. They terrorize the villages and the main character, with his sword, has to fight them. And there could be an old hermit who knows a great deal about the history of the sword and the significance of the wine in the area. The hermit could play an important role in guiding the main character on his journey.
I'm not entirely sure as I haven't read it completely, but I assume there would be Shinigami characters as main ones. Maybe a young or inexperienced Shinigami who is learning the ropes.
I don't know for sure, but it could be a hero and a villain.
I don't know for sure as I haven't read it. It could be some local heroes or ordinary people with extraordinary stories.
As I haven't had the chance to read 'Ballad of the Black and Blue Mind A Novel', I'm unable to name the main characters. It could be a story about an individual with a troubled mind, so perhaps the main character is someone who is experiencing this 'black and blue mind' state. Or it could be multiple characters who are all connected to this concept in different ways.
The main characters are surely the soldier's wife. And of course, the soldier himself, though he may be mostly absent physically in the story but his presence is strongly felt through the wife's experiences and emotions related to him.
Obviously Caius is one of the main characters. And the baby, of course. There might also be some secondary characters like friends or foes of Caius who play a role in the story. For example, a friend who gives Caius advice on how to take care of the baby or an enemy who tries to steal the baby for some evil purpose.
The main characters are often the champions themselves. They are the central figures in the game and so in the fanfic. For example, Link is a very common main character as he is a key part of the Champions Ballad story.