There could be multiple main characters. The little green tractor is surely one. There might also be an older farmer who has owned the tractor for years and knows all its quirks. And there could be other animals on the farm that interact with the tractor in some way, like the cows that the tractor helps to bring hay to, or the chickens that scatter as the tractor passes by. These characters together could form the main cast of the 'the little green tractor story'.
The main characters might include the little green tractor itself, and perhaps a young boy or girl who has a special connection with the tractor. They could be the ones who take care of it, ride it around, or rely on it for various tasks on the farm.
Since I don't know the story, it could be the owner of the little green tractor. Maybe it's a farmer.
I'm not sure exactly as I haven't read it. But it might be about a little green tractor's adventures, like maybe it works on a farm, helps with plowing fields or transporting things around the farm.
In some of the stories, there could be other tractors or farm machines that are like side characters. But the little red tractor is the central one. It's the one we follow through its daily tasks and adventures on the farm. It has its own personality, like being brave when facing challenges and friendly towards others, which makes it the main focus of the stories.
In these stories, the central character is the little red tractor. It's likely that there are some other vehicles too, like a big green truck that brings supplies to the farm. There may be a group of mice living in the barn that the little red tractor sometimes encounters. And don't forget the family of the farmer, such as his young son or daughter who might be excited to see the little red tractor at work. These characters together create an interesting world in 'the little red tractor stories'.
Obviously, the little green pig is one of the main characters. It's the one that the story is centered around.
Since I don't know the story, I can only guess. The main character is surely the little green dinosaur. There might also be other dinosaurs, like its parents or siblings.
There might be other animals too. For instance, a wise old owl could be another main character. The owl could give advice to the little green snake or help it out in some situations. And perhaps a friendly squirrel that befriends the snake and they have adventures together.
Since I don't know the story, I can only guess. There must be the little green monster itself. Maybe there are other friendly or unfriendly creatures that it interacts with, like a wise old owl or a mischievous little rabbit.
The main character is Little Green Riding Hood herself. She is the one who sets out on the journey through the forest.
Since I don't know the exact 'little green men novel', I can't say for sure. But it could be an adventurous scientist who is eager to study the little green men. Maybe there's also a military officer who is initially suspicious of the little green men's intentions.
Since we don't know the exact story, it's hard to say for sure. But likely the little green snake is a main character. There could also be other animals like mice if it's a predator - prey kind of story, or perhaps a wise old owl that gives advice to the snake.