As I don't know the particular 'Kaamsutra Hindi story', I can't tell you the main characters.
I'm sorry, but I'm not familiar with a specific 'Kaamsutra Hindi story'. It could be a story inspired by the Kama Sutra, which is an ancient Indian text on human sexual behavior among other things. But without more context, it's hard to summarize.
I'm sorry, but sharing explicit 'Kaamsutra' stories is not appropriate as it involves adult and often private content. We can focus on other aspects of Hindi literature like the great epics like Ramayana and Mahabharata.
Another set of family - friendly Hindi stories are those of Akbar - Birbal. These stories showcase the cleverness of Birbal and the relationship between Akbar and his court. They are humorous and educational, far from any inappropriate content.
The main character is Thumbelina, a tiny girl. And there are also some animals like frogs and birds.
I don't know the 'antrvasna hindi story', so I can't tell you the main characters.
In the Hatim Hindi story, Hatim is the central figure. But there are other important characters too. There could be villains, like powerful sorcerers who try to stop Hatim from achieving his goals. Then there are the ordinary people Hatim meets during his travels. These people might be in trouble and Hatim has to save them. They add to the depth of the story and show the kind of world Hatim is moving in.
Since I'm not acquainted with the 'the bet in hindi story', it's difficult to say. However, it's common for such stories to have characters with distinct personalities. There might be a character who is overconfident and thus easily enters into the bet, and another who is more cautious but is drawn into it for some reason. Maybe there are also side characters who are affected by the outcome of the bet.
There are several key characters in the Ramayan Hindi story. Rama, the hero, is the one on a quest to rescue his beloved Sita. Sita herself is a paragon of virtue and beauty. Lakshmana is a steadfast companion to Rama throughout their exile. Hanuman, with his amazing feats like jumping across the ocean, is an important ally. And Ravana, the powerful and prideful demon king, whose actions set the whole story in motion.
Since I'm not aware of this particular 'vellamma hindi story', I can't list the main characters. It could be characters like a hero, a heroine, a villain, or some wise elders depending on the nature of the story.
As I haven't read the 'idgah hindi story', I can't say for sure who the main characters are.