It could be a young hero who is on a quest but keeps getting beaten down physically and emotionally.
The plot could involve a character facing various hardships like physical pain, emotional distress or difficult situations. Maybe the main character gets injured in an accident and has to struggle to survive, both physically and mentally.
If it's a different '300 original story', perhaps the main characters are the leaders of the 300. For example, if it's a group on a quest, the ones who are in charge of leading the 300, making decisions, and guiding them through the various trials and tribulations would be the main characters.
In the original 'Alice's Adventures in Wonderland', the main characters are Alice, the White Rabbit, the Cheshire Cat, the Mad Hatter, and the Queen of Hearts.
In the original batman story, there are several main characters. Bruce Wayne, who is Batman, is of course central. He is the one on a mission to save Gotham. Alfred, his butler, is a very important character as he provides support, both emotional and practical, to Bruce. Commissioner Gordon is also a main character. He is an ally of Batman in the fight against crime in Gotham. He helps Batman in various ways, like sharing information about crimes in the city.
The main character is Charles Lee Ray, the serial killer whose soul gets transferred into the doll, and of course, Chucky the doll itself.
The main characters are a priest and a novitiate. They are the ones sent to the abbey to deal with the situation regarding the possessed nun.
The main characters in the 'Pitcairn Original Story' are likely the Bounty mutineers. They were the ones who initially settled on Pitcairn Island.
Since I'm not sure which specific 'cabaret original story' you mean, it could be the performers. For example, singers, dancers, and comedians who were the heart of the cabaret shows.
The main character is Conan, of course. He is the central figure around which the story revolves.
The main characters are Devdas, Paro, and Chandramukhi. Devdas is the tragic hero in love with Paro. Paro is the woman he loves but is separated from. Chandramukhi is a courtesan who falls in love with Devdas.