Not having read the 'triangle stone dragon children's novel', it's difficult to name the exact main characters. However, given that it's a children's novel, we can expect children to be at the center of the story. They could be ordinary kids who stumble upon the mystery of the triangle stone and then cross paths with the dragon. There may be a group of children, each with their own personalities and skills. The dragon, which is a significant part of the title, is most likely a main character too. It could be a friendly dragon that helps the children or a misunderstood creature that the children need to befriend. There might also be some side characters like the children's parents or guardians who play a role in the background of the story.
I'm not sure specifically as I haven't read this particular 'triangle stone dragon children's novel'. It could be about an adventure involving a triangle - shaped stone and a dragon. Maybe it's set in a magical world where children discover the stone and it has some sort of connection to a dragon.
The main characters are the travelers or strangers who come to the village with a stone. And also the villagers who at first are skeptical but then start contributing to the stone soup.
In 'How to Train Your Dragon', the main characters are Hiccup, a young Viking boy, and his dragon Toothless. Hiccup is small and not very typical of a Viking, but he has a big heart and a curious mind. Toothless is a Night Fury dragon, very intelligent and cute in his own way.
Since I don't know the details of this 'life of stone dragon story', I can't say for sure who the main characters are. But it's likely that the stone dragon itself is one of the main characters.
Since we don't have the full story, it's hard to say for sure. But most likely, the dragon itself is a main character. There might also be a hero or a villain. If the story is about someone trying to take the dark stone from the dragon, that person could be a main villain. And if there's someone trying to protect the dragon or the stone, that could be a hero.
I don't know for sure as I haven't read the novel. But I would expect there to be a child as one of the main characters, probably the one who discovers the portal and interacts with the puzzle dragons.
I don't know for sure, but I would guess there are the children, and of course, the last dragon.
The main characters are George and the dragon. George is the hero who fights the dragon.
In 'How to Train Your Dragon' books, Hiccup is a main character. He is a scrawny but clever boy. Toothless, the dragon he befriends, is also a key character. Hiccup has to deal with the expectations of his Viking tribe while forging a unique bond with Toothless. There are also other characters like Stoick, Hiccup's father, who play important roles in the story as they interact with Hiccup and his dragon - related adventures.
The important characters in 'The Sword in the Stone' include Arthur, of course. He's the protagonist whose fate is tied to the sword in the stone. Merlin is a central figure as well. His wisdom and magic are instrumental in Arthur's development. Sir Ector is important as he takes care of Arthur growing up. Kay, Arthur's foster brother, also has a role to play. He is part of Arthur's life before he discovers his true identity. These characters together create the fabric of this classic children's story.