In the 'Three Friends of Winter' story, the key characters are pine, bamboo, and plum. Pine represents endurance as it endures the cold without losing its foliage. Bamboo is a symbol of resilience, being able to bend without breaking during winter storms. Plum is the one that brings a touch of beauty and hope as it blooms in the cold winter. These three together form the essence of the story and are highly symbolic in many cultures.
I'm not sure as the 'Winter Story' isn't defined in detail. But it could be a family trying to stay warm during a harsh winter, so the main characters would be the parents, children, and maybe an old grandparent.
Since I don't know the specific 'friends of the friends story', I can't say for sure. But likely, it would include your friends, their friends, and perhaps you as the main characters. Your friends are the link between you and their friends, and the story might revolve around how all of you interact.
Perhaps there are some unique characters like a little snowman named Frosty who becomes friends with the kids. And also a kind old man who lives in a cabin in the woods and gives the kids warm cocoa during their winter adventures.
The Winter King himself is surely a main character. There might also be his loyal subjects, perhaps some knights or advisers who help him rule his wintry kingdom.
I don't know exactly as I haven't read it. But perhaps there could be a young man and a young woman.
In the 'king winter story', King Winter is probably the main character. However, depending on the nature of the story, there could be other important characters. For example, if it's a story about a journey, there might be a group of companions who accompany King Winter. These could be a wise old man who has knowledge of the winter magic, a young boy who is eager to learn from the king, and a talking animal, like a wolf or a raven, which could be his guide or messenger.
Since I don't know the specific 'kid winter story', it could be a young boy or girl as the main character. Maybe there are also some friendly animals like a dog or a rabbit.
The winter king would be a key character for sure. There might also be characters like his loyal subjects who depend on him during the winter. And perhaps there are some opposing forces, like those who try to disrupt his rule or the natural order of winter.
Perhaps the main characters are a group of friends. They could be planning a big Christmas event in their small winter town. One of them might be a bit of a Scrooge at first, not really into the Christmas spirit, but through the events in the story, like helping the local orphanage or decorating the town square, they come to embrace the joy of Christmas.