The main character seems to be the little king. But considering it's a box theater story, there could be a narrator who is also a character in a way. The narrator could be guiding the story, introducing the little king and his world. And if there are any events or conflicts in the story, there might be other characters like antagonists who oppose the little king's plans or actions in the box theater story.
Based on the title, the most obvious main character is the little king. However, in a theater - related story, there could be actors or performers who interact with the little king. They might play important roles in the story too, perhaps as friends, enemies or guides for the little king within the box theater setting.
Since we only have the title, we can assume the main character is the little king. There may also be other characters like his subjects, advisors or maybe some magical creatures if it's a fantasy - type story.
The 'box theater little king's story' could be a narrative that combines the concept of a miniature theater, which is the box theater, with a character of a little king. It might be a story that uses the confined space of the box theater as a metaphor for the limited world of the little king. For example, the little king could be facing some sort of restriction in his kingdom, similar to how a performance in a box theater has spatial limitations. And the story could be about how he overcomes these limitations or discovers new things within his small world.
As I don't know the specific 'little king's story', it could be the little king himself as the main character. Maybe there are his loyal servants or advisers too.
Since I don't know the specific 'new little king's story', it's hard to say for sure. But most likely the little king himself would be a main character. There could also be his advisers, perhaps a queen or princess, and maybe some sort of villain who opposes the king.
As I don't know the story, I can't say for sure who the main characters are.
I'm not sure as I haven't read the specific 'the little black box short story', but often in such stories, there could be a curious protagonist who is drawn to the box.
Obviously, Little King Dice is a main character. There could be supporting characters such as his servants or rivals. His servants might help him in his quests or daily activities. And his rivals would be those who oppose him, either for power or some other reasons in the story.
I'm not sure about the main characters in 'onii little king story' as I don't know the story well. But I assume the 'little king' is one of the main characters. And the 'onii' might also be a main character, perhaps having an important role in the little king's life or in the events of the story.
Since I don't know the story, I can't be sure. But I guess the main character is Rat King Little King.
In the 'corobo little king's story', Corobo is the main character as the little king. His servants or knights could be important characters too. They might help him in his battles or in ruling the kingdom. There could be a love interest for Corobo, which would be another key character. And then there might be some sort of council of elders in the kingdom who have a say in the kingdom's affairs and thus are important in the story as well.
Since I'm not very familiar with this specific 'Verde Little King's Story', I assume the main character is Verde, the little king himself. There might also be his subjects, such as the peasants, the knights, and the nobles in his kingdom.