As I'm not familiar with the 'the smallest christmas tree story', it's all speculation. It could have a protagonist who is either a child or an adult who is drawn to the smallest Christmas tree. There may be other characters like neighbors who comment on the choice of such a small tree. And if it has a bit of a magical element, there could be some sort of Christmas spirit or fairy - like character that helps the small tree shine and become important in the story.
Since I haven't read this particular story, I can only guess. It may tell the story of a small Christmas tree that starts out as an underdog. It could be about how it overcomes its small size, for example, it might be in a forest full of large, majestic trees waiting to be cut for Christmas. But this little tree, through some series of events, becomes a symbol of hope or a source of great Christmas spirit. Maybe it's discovered by someone who was looking for something different, not the typical large tree, and this small tree ends up making their Christmas extra special.
Typically, there would be the littlest Christmas tree itself. There might also be characters like people who come to choose Christmas trees, perhaps a family or a group of friends. And there could be other Christmas trees in the story that contrast with the littlest one.
As I'm not familiar with the 'the last christmas tree story', it might have characters like a little boy or girl who discovers the last Christmas tree. There could also be a tree seller who has been trying to sell all the trees and this one is the last. And there may be some neighbors or friends who are involved in the story, like they help the main character get the tree or they have an opinion about the last tree.
There might be the lonely Christmas tree itself as the main character. Maybe there are also some animals like squirrels or birds that interact with the tree, either by making it more lonely or perhaps befriending it.
In 'the little christmas tree story', the little Christmas tree is the central character. It may also have characters like children who are excited to decorate it. There could be a shopkeeper if the tree is bought from a store. Additionally, there might be a character like a friendly neighbor who helps with the decoration of the tree. These characters would all play a part in the story of the little Christmas tree.
Since I haven't read the story, I can't say for sure. But it could be a couple, perhaps a man and a woman. Maybe there's also a character like a Christmas tree seller who plays an important role in bringing the two main characters together.
There isn't really one set list of main characters in the general legend of the Christmas tree. However, if we consider Martin Luther as part of the story, he could be considered a significant figure. He was inspired by the beauty of the fir tree, which influenced the use of Christmas trees in the way we know them today.
Since I don't know the exact 'willow tree Christmas story', it could have characters like a kind old man who takes care of the willow tree during Christmas. Maybe there's also a young child who discovers the magic of the willow tree at Christmas time.
Since I don't know the story, it could be a family, like a father, mother, and their children. They are often the main characters in Christmas - related stories about Christmas trees as they are usually the ones involved in finding and decorating the tree.
There's no way to be sure without reading the specific story, but it might include the person who discovers the ugly Christmas tree, perhaps a child or an old man. And there could be other characters like those who initially reject the tree.