Well, without reading the story, it's difficult to be certain. But the princess is the obvious main character. There may be some servants or guards from her own kingdom who are searching for her and they could be important characters as well. Maybe there's a magical creature, like a talking fox or a friendly dragon that befriends the princess during her time of being lost and helps her in some way.
Adam and Eve are central as they are the first humans. They live in Paradise until they are tempted. Satan also plays a major role as he is the tempter, who has his own motives for causing the downfall of Adam and Eve.
The main character is the lost boy. He is at the center of the story. There could be other important characters such as his family members, who might be the reason for his being lost, or the people in the place where he is lost. For example, if he is lost in a forest, there could be forest rangers or local tribespeople who play significant roles in his story. They can either assist him in finding his way back or pose more challenges for him.
The main character in 'the lost key short story' could be a woman. She could be a busy mother who has lost the key to her home while running errands. As for other characters, there might be her children who are also worried about the lost key as it means they can't get into their home. There could also be a locksmith character who comes into the story later, either to help or to create more drama by being untrustworthy or having his own motives regarding the key.
In 'the lost kitten short story', the central character is the kitten. However, depending on the story, there could be other characters as well. For example, there could be other animals in the neighborhood where the kitten got lost. There might be a kind old dog that tries to help the kitten find its way home or a mean cat that chases the lost kitten away. And of course, the owner of the kitten is an important character too, as they are likely searching everywhere for their beloved pet.
There might be a young child who wanders off into the woods and gets lost. The child could be a main character. Or perhaps an old man who has some special skills for survival in the woods but still gets lost. In some cases, there could be a forest ranger who gets lost while on duty in the woods and he or she is the main character.
There could be a brave and curious explorer as one of the main characters. He might be someone who is always seeking new and unknown places. There could also be a knowledgeable scientist who accompanies the explorer. The scientist would be interested in studying the unique flora and fauna of the lost world. And perhaps there's a local guide who knows some secrets about the area leading to the lost world. This guide would be essential in helping the others navigate through the difficult terrains and avoid the hidden dangers.
The main character is a woman who borrows the necklace. There is also her husband who tries to help her when she loses the necklace.
Perhaps there is also a mysterious figure in the city. This character could be symbolic of the unknown or the allure of the city. They might lead the protagonist on a wild goose chase or be the key to the protagonist finally finding their way, either literally or figuratively.
I'm not sure without reading the story, but it could be the person who lost the wallet and perhaps the person who finds it.
I'm not sure as I haven't read the exact 'lost in the desert short story'. But usually, there could be a lost traveler. This person would be the central focus as they try to find their way out of the desert.