There could also be a group of adventurers. They might come across the stone during their travels. Each of them could have different reactions to the stone, and their different personalities and desires could lead to conflicts or cooperation within the group as they deal with the mystery of the stone.
I'm not sure without reading the story, but it could be a person who finds the stone. Maybe it's a young child who is curious about the stone and their actions drive the story forward.
Perhaps there is an old hermit in the story. He might have some knowledge about the stone, like its origin or its power. He could be a guide for the other characters who are involved with the stone, and his wisdom could play an important role in the development of the story.
Since we don't have much information about the story, we can only guess. There could be a protagonist who is trying to understand the stone eater. Maybe there's a wise old character who has some knowledge about the stone eater and tries to pass it on to others. And of course, the stone eater which is likely to be a very important character in the story.
There is also a man who is somehow related to the woman's past. He might not be fully aware of the woman's true feelings towards him at first. Their interactions are crucial to the development of the story. Additionally, there may be other minor characters who help to set the context and background of the story, like people in the town or on the journey they are on.
The main characters are the travelers and the villagers. The travelers start the whole stone soup thing, and the villagers are the ones who end up contributing to the soup.
The main character is Arthur. There may also be other characters who try to pull the sword but are not as important as Arthur.
The main characters are usually the travelers who make the stone soup and the villagers. The travelers initiate the process of making the soup and the villagers are the ones who contribute to it.
The stone boy is the most prominent character. There may be other minor characters like his family members or people in his community, but the story mainly focuses on the stone boy's experiences, his actions and inactions, and how others interact with him or rather, fail to interact with him in a normal way.
Probably the stone boy and perhaps some other characters who interact with him. For example, his parents if they are part of the story. They could play an important role in shaping the stone boy's character and the events that unfold. Maybe there are also other children in the story who either befriend or bully the stone boy, which would also make them important characters in the overall narrative.
Perhaps there is a character who is in charge of maintaining the stone ship, if it's in some sort of harbor or place where it needs upkeep. This character could be one of the main ones, and his or her actions and thoughts could drive the story forward. For example, they might be constantly trying to figure out the origin and purpose of the stone ship.
The stone boy is surely a main character. Then there might be a character like an old wise man who could guide the stone boy on his journey, whether it's a physical or emotional journey. Also, there could be a bully - type character who makes the stone boy's life difficult, highlighting the challenges the stone boy has to face.
Since I don't know the details of 'the stone story', I can't say for sure who the main characters are. It could be a young adventurer who is drawn to the stone for some reason.