In 'Goldilocks and the Three Bears', the characters are Goldilocks and the three bears - papa bear, mama bear and baby bear.
For 'The Three Little Pigs', the characters are the three little pigs and the big bad wolf.
I'm not sure of the specific full story without more context. It could be a case of a bully targeting a vulnerable blind child, which is extremely cruel. There might be underlying reasons like the first kid having some behavioural problems or being influenced by a bad environment.
The characters' stories in 'Catch That Kid' are intertwined. The girl's drive to save her father brings the group together. The other two kids have their own personal stories too. For example, they both come from different backgrounds but find common ground in this adventure. They all learn valuable lessons about friendship, family, and facing challenges throughout their individual and collective stories in the movie.
One full kid story could be 'The Little Red Hen'. The little red hen found some grains of wheat. She asked her friends, the cat, the dog and the pig, to help her plant it, but they all refused. So she did it all by herself. She planted the wheat, watered it, harvested it, took it to the mill to be ground into flour, and then made bread. When the delicious smell of the bread filled the air, her friends suddenly wanted to share. But the little red hen said no, since they didn't help at all. It teaches kids about the value of hard work.
In 'The Three Little Pigs', the main characters are the three little pigs and the big bad wolf. The pigs build houses of different materials to protect themselves from the wolf.
The full story of 'the kid and the wolf' is a cautionary tale. The kid, perhaps seeking attention or just being naughty, yells 'wolf' when there's no danger present. The villagers, who are initially concerned and run to help, start to lose trust as the false alarms keep coming. When the actual wolf does show up, they assume it's another false cry. This story teaches us about the importance of honesty and the danger of losing credibility through false claims.
The main characters are the princess, who is Sleeping Beauty. There is also the evil fairy who curses her and the good fairy who tries to help. And of course, the prince who wakes her up.
Perhaps there are some friends of the Flamingo Kid that are main characters as well. They could be different in personalities. For example, one could be really brave and the other very clever, and together they make the stories more interesting by complementing the Flamingo Kid's own traits.
In 'Snow White', Snow White is the main character. The seven dwarfs also play important roles. In 'Hansel and Gretel', Hansel and Gretel are the main characters. In 'The Velveteen Rabbit', the velveteen rabbit is the main character, and the boy who owns the rabbit also has a significant part in the story.
The main character is of course the Ninja Kid himself. He is often brave and resourceful.
It's hard to say exactly who the main characters are without reading the 'casa kid stories' specifically. But they could be kids like you and me, or perhaps some friendly animals.