The main characters are, obviously, the girl and the snake. The girl is likely a symbol of innocence or perhaps ignorance in the story. And the snake, which is often seen as a symbol of cunning or danger in many stories from different cultures.
Obviously, the main characters are the snake bird and the girl.
In the 'Mowgli meets snake girl story', the main characters are Mowgli and the snake girl. Mowgli, being from the jungle and having a connection with all the jungle animals, is one of the main characters. The snake girl, with her snake - like features and her own little corner of the jungle, is the other main character. Their personalities, one being more of a jungle - born adventurer and the other a mysterious snake - associated being, are what drive the story forward as they meet and get to know each other.
In a typical 'the snake girl story', the snake girl is of course a central character. There could be a young boy who befriends her despite her differences. He might be the only one in the village who is not afraid of her snake - like traits. Also, there could be a villain, like a sorcerer who wants to use the snake girl's powers for his own evil purposes.
Maybe there is an antagonist in the fanfic, someone who wants to harm the girl or use the snake for their own evil purposes. This could add more drama and conflict to the story, with the girl and the snake having to team up to fight against this bad character.
The main characters are obviously the snake and the man. The snake represents danger or perhaps a force of nature that is not easily tamed. The man is the one who tries to interact with the snake in some way.
Often, there is a male protagonist who might be a curious traveler or a brave warrior. He might be the one who has a special encounter with the snake woman. His actions and reactions towards her are crucial in driving the story forward. He could either fall in love with her, despite her snake - like nature, or try to defeat her if he perceives her as a threat.
Since I don't know the exact 'the black snake story', if it's a typical one about a black snake in nature, the main character would likely be the black snake itself.
In the boy and the snake story, the two main characters are a boy and a snake. The boy is likely a naive or kind - hearted character who stumbles upon the snake, which is a symbol of danger or deceit in the story.
The main characters are an Indian and a snake. The Indian is probably a human figure who has some sort of encounter or relationship with the snake, which forms the basis of the story.
Obviously, the main characters are the snake and the woman.