Probably the most prominent would be the leading Tomb King. He would be in charge of leading his undead forces, making decisions about battles and the defense of their tombs. There might also be necromancers who serve the Tomb Kings, playing important roles in raising more undead and maintaining the magic that keeps the Tomb Kings' power intact.
In the Tomb Kings short story, aside from the Tomb Kings, there could be characters like tomb guardians. These are powerful constructs or undead beings whose sole purpose is to protect the tombs. Another possible main character could be an adventurer who stumbles upon the Tomb Kings' domain. This adventurer's interaction with the Tomb Kings and their world could drive the plot forward, as they might try to steal some of the valuable artifacts from the tombs or learn the secrets of the undead rulers.
Since I don't know the exact story, I can only guess. They could be three powerful kings, perhaps named something like King Arthur, King Henry, and King Richard.
One of the main characters is often the Tomb King himself. He is the undead ruler with great power and a thirst for restoring his lost kingdom. There are also the powerful Liche Priests who play important roles in the stories, using their magic to aid the Tomb King.
Since we don't have the actual story, it's impossible to know for sure. But typically, there would be a 'king' character who is in a position of power within the game. There might also be other players who are either friends or foes, depending on how the story unfolds.
One of the main characters is Kaladin. He is a complex character with a lot of depth.
Most likely the sand kings themselves are the main characters. Since the story is named after them, they would play a central role.
Given the title 'two kings short story', the two kings are probably the central characters. But in a short story, there could be other characters that are crucial to the development of the plot. Maybe there is a young hero who serves one of the kings and through his actions, the relationship between the two kings is affected. Or perhaps there is a wise old woman who gives advice to one of the kings, which then influences the actions of both kings. It all depends on the specific details of the story which unfortunately I'm not aware of.
I'm not sure specifically. But perhaps there could be an adventurer who is intrigued by the locked tomb.
The Tomb Kings short story is often filled with elements of ancient Egyptian - like mythology in a fantasy setting. It might involve the undead kings rising from their tombs, their quest for power or to reclaim their lost kingdoms. It could also detail the magic and curses associated with them.
One main theme is the concept of immortality. The tomb kings are undead, and their quest to maintain their existence and power in the afterlife is a recurring theme.
In a possible '2 kings story', apart from the two kings, there might be a brave knight who serves one of the kings. This knight could be the key to winning battles or resolving disputes between the two kings. And there could be a wise old man who gives advice to the kings, guiding their decisions.