The main characters are obviously the rat and the cat.
The main characters in 'the cat and the rat short story' are the cat and the rat. The cat is often portrayed as a menacing figure, always on the prowl for the rat. The rat, in contrast, is a rather defenseless but clever character. It has to rely on its wits to survive the cat's constant pursuit.
In the cat and the old rat story, the central figures are the cat, which represents a threat, and the old rat. The old rat has to use its intelligence to deal with the cat, so these two are the main characters in this narrative.
The two main characters in the 'lion and the rat short story' are, as the name suggests, the lion and the rat. The lion is this majestic, strong beast that dominates the forest. The rat, on the other hand, is a tiny creature that scurries around. But their encounter and the events that follow make them the central figures in this story. The lion's initial dismissal of the rat and the rat's later heroics create the plot's main arc.
Since I don't know the exact 'the rat catcher short story', but most likely the main character is the rat catcher himself. There might also be rats as sort of secondary characters that play an important role in the story.
The main characters are obviously the rat and the elephant.
Since I don't know the specific 'rat king short story', it could be the rat king itself as a main character. There might also be other rats in the group that play important roles, like his followers or rivals.
In 'the rat and the cat short story', it might be that the rat is living in a hole and the cat discovers its hiding place. The rat then has to use its wits to escape from the cat which is much stronger and faster. For example, the rat could lead the cat on a wild chase through a maze - like house or garden, using small spaces that the cat can't easily access.
The cat chases the rat in the story. Usually, in such a story, the cat wants to catch the rat for food or just out of its natural predator - prey relationship. The rat tries to escape using its small size and ability to hide in small places.
Since it's the 'king rat story', the main character is likely the king rat itself. There may also be other rats in the story, like his loyal subjects or rivals.
In the 'kid and rat story', the two central figures are, as the name suggests, a kid and a rat. The kid could be a young boy or girl, and the rat is the other important entity in the story. Their actions and interactions form the core of the story.