Obviously, the main characters are the big tree and the little tree.
There could be a variety of characters. Maybe there's an old man who has been taking care of the big tree for years. There might also be children who love to climb the tree.
It depends on the specific Big Banyan Tree Story. It could be the people who live near the tree, perhaps an old man who takes care of it. Or it could be the animals that inhabit the tree, like birds and monkeys.
The main character is obviously the little fir tree. There might also be other characters like the animals in the forest that interact with the fir tree, such as the birds or squirrels. And perhaps the people who come to the forest to cut down the trees or decorate them could also be considered as part of the characters in the story.
The main character is obviously the little pine tree itself.
The moral could be about growth and protection. The big tree might represent the older generation or those with more experience protecting and guiding the little tree, which stands for the younger or less experienced. Just like in life, the elder ones should help the younger to grow in a healthy way.
There might be the big tree itself as a main character. It could be that there are also little animals like birds that make their nests in the tree or squirrels that run around it.
The main character is, of course, the little fir tree itself. It goes through various experiences and emotions throughout the story.
Since I don't know the story well, I'd guess the main character is surely the good little Christmas tree itself. There might also be some other characters like the people who cut it down or the family that takes it home.
Since I don't know the story well, there could be the little willow tree itself as a main character. Maybe there are some birds or insects that interact with it.
In the 'big apple tree story', the big apple tree is the central figure. However, other characters could include small insects that live on the tree, and maybe a little boy or girl who comes to pick the apples. The tree is the giver, and these other characters are the receivers in different ways.