If we consider the Martin Luther story, Martin Luther is the key figure. He was a reformer, and his inspiration from the forest scene led to the idea of the Christmas tree. His love for nature and his religious beliefs combined in that moment when he saw the beauty of the snow - covered evergreens and thought of bringing that beauty and symbolism into his home for Christmas.
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.
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.
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.
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.
There could be a little Christmas tree as the main character. And perhaps a family or a person who discovers and takes care of the tree.
Since we don't know the exact story, but if it's a typical 'christmas tree spider story', the main character would likely be the spider itself.
If it's a story about an owl getting trapped in a Christmas tree, the main characters would likely be the owl, and perhaps some kind - hearted neighbors or a wildlife expert who comes to help the owl get out of the tree. The owl is the center of the story as it's the one in the unusual situation of being in the Christmas tree. And the others play roles in either causing the situation (like if they put up the tree too close to the owl's habitat) or resolving it.
Maybe there's a family, including a mother, father and their kids. They are all intrigued by the magic Christmas tree. There might also be a reclusive hermit who lives near the tree and has a special connection to it. He warns the villagers about misusing the magic of the tree.
Well, the fir tree is the central character. There are also the people who cut the tree down, the ones who decorate it, and the animals that might have interacted with the tree in its natural state, like birds or squirrels perhaps. But the fir tree is really the focus, as the story revolves around its journey from the forest to various places during Christmas time.
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.
Maybe a little girl or boy. They could be the main characters in the 'christmas tree cutie story'. For example, they might be the ones who discover a magical element related to the Christmas tree and are considered the 'cuties' in the story as they bring the magic to life.