It could be the kids, and perhaps a friendly conductor who guides them on the Holiday Express. There might also be some magical characters like a talking reindeer or a helpful elf.
Probably the kids who are taking the holiday express journey.
Perhaps the main characters are siblings. Brothers and sisters who go on holiday adventures together, sometimes arguing but always loving each other in the end. They could be exploring a big forest near their grandparents' house during the holidays, with the older sibling looking out for the younger one.
It could be about a magical train journey during the holidays. Maybe it involves kids taking a special train, the Holiday Express, to a wonderland filled with presents, elves, and Santa Claus.
Given the lack of information about 'the express true story', the main characters could be a group of people trying to achieve something quickly. Maybe they are entrepreneurs in the express business, facing competitors and trying to make their mark. Their interactions, struggles, and successes would then form the core of the story.
The main character is a young boy. And of course, there's Santa Claus. The conductor of the Polar Express is also an important character.
If it follows the general theme of the 'Roman Holiday' concept, there would likely be a character who represents the upper class, restricted by her status, like a princess. And then there would be another character, maybe a local or a traveler, who is more free - spirited. Their encounter and the interaction between these two different worlds of characters would be the focus of the story.
Perhaps the main characters are siblings. A brother and a sister who have to face some challenges together. The brother could be the more adventurous one, always getting into little troubles, while the sister is the smart one who figures out solutions. There might also be their pet dog that tags along in their adventures and plays an important role in the story.
The main character is a young boy who embarks on this amazing journey on the Polar Express. He is curious and excited throughout the story. Santa Claus is also a key figure. He is at the North Pole and is the one the children are eager to see. There are also other children on the train who interact with the main boy, though they are not as fully developed as the boy and Santa Claus, but still play a part in the story.
The main character is a young boy. And of course, Santa Claus is also a very important character. There are also the elves at the North Pole and the conductor of the Polar Express.
The boy is the central character in the 'polar express short story'. He is the one who experiences the entire journey on the Polar Express. There are also other children on the train who can be considered important characters as they are part of the boy's adventure. And Santa Claus, who is at the end of the journey, is a key figure as well. He represents the magic and the spirit of Christmas in the story.
Since I don't know the story, I can't say for sure who the main characters are. But I assume there would be members of the Jones family like Mr. and Mrs. Jones, and maybe their children.