I don't know as I haven't read the story, but it could be the tiger itself, and perhaps some other animals like deer or monkeys that interact with the tiger.
Not having read 'the tiger's heart short story', it's hard to say for sure. But it could be that the main character is the tiger, and there are some secondary characters such as a wise old owl that gives advice related to the tiger's heart. There could also be a cub that the tiger is protecting, and the story could revolve around the relationship between the two, with the tiger's heart being the driving force behind the actions of the tiger in protecting the cub.
I'm not sure specifically as I haven't read this story. But generally, it could be about the nature of a tiger, perhaps its courage (represented by the heart) or some adventure related to a tiger.
Well, the tiger is obviously one of the main characters as the story is told from its perspective. And there are also the various humans in Malgudi that the tiger encounters.
Since I don't know the exact 'paper tiger short story', I can't say for sure. It could be a protagonist who discovers the 'paper tiger' nature of someone or something, and there might be an antagonist who is initially seen as a big threat.
The main characters are the young man, the princess and the king. The young man is in love with the princess. The king is the one who arranges this cruel trial. And the princess is the key figure as she knows what lies behind the doors and her decision (signaling) is crucial to the young man's fate.
The main characters are obviously the lion and the tiger.
Since I'm not familiar with the 'End of the Tiger' short story, I can't determine the main characters. But perhaps it could have a tiger as one of the main characters, and maybe there are also human characters involved, such as a hunter or a conservationist, depending on the nature of the story.
Since it's a short story about a scary tiger, there could be a hunter as one of the main characters. The hunter might be after the tiger or be in a situation where he is threatened by it. Another character could be a local guide who has knowledge about the tiger's territory. Or perhaps there is a young child who gets lost in the forest where the tiger lives, and the story is about the child's encounter with the scary tiger.
The main characters are the young man who is on trial, the princess who loves the young man, and the king who arranges this cruel form of trial. The young man is in a difficult situation because of the king, and the princess is torn between her love for the man and her jealousy (if he were to choose the lady behind the door).
The main characters in 'a tiger in the house short story' would probably be the owners or inhabitants of the house. They are the ones who have to deal with the tiger being there. And of course, the tiger is a main character too. It's the source of all the action and drama in the story. There might also be some secondary characters like neighbors who might get involved when they hear about the tiger in the house.
It's likely that the monkey is a main character. And there might be a villain, perhaps another animal or a magical creature that desires the monkey's heart for some reason. There could also be a helper character, like a wise old bird or a friendly squirrel that tries to assist the monkey in protecting its heart.