I don't know who the main characters are in the 'giant story' because you haven't provided any details about it. It could be a hero who has to face the challenges presented by a giant, or it could be the giant itself as the central figure in the story.
As we have no clue about the 'giant story', the main characters could be diverse. It could be a family in a story where a giant threatens their village, and they have to find a way to deal with it. Or it could be a wizard who tries to control a giant for some purpose, with the interactions between them being the focus of the story.
I don't know the exact main characters in the 'ghost giant story' since I don't know the specific story. But it could be a brave hero who tries to face the ghost giant, or a group of villagers who are affected by the ghost giant's presence.
Since we don't know the exact 'giant man story', it could be just the giant man himself as the main character.
The main character is surely the friendly giant. There might also be some villagers or children who interact with the giant.
Obviously, the giant woman is a main character. There might also be some normal - sized people in the story, like the villagers who interact with her. They could be either friendly or afraid of her.
In the 'iron giant original story', the two most prominent characters are Hogarth, who is a curious and brave little boy. He is the one who first discovers the Iron Giant and forms a bond with it. And of course, the Iron Giant itself. It is a large, metal being that is initially a mystery but as the story progresses, shows a lot of humanity through its interactions with Hogarth.
The main characters are the selfish giant and the children. The giant owns the garden and initially bars the children from it. The children are the ones who bring life and joy to the garden when they are finally allowed in.
Since I don't know the exact 'giant little brother story', it's hard to say. But most likely, the main character is the little brother who has the 'giant' aspect. There might also be family members like his parents or siblings involved.
Since I don't know the exact story, I can only assume that the main character is the little girl. But there could also be other characters like her family, friends, or people she meets during her adventures as a 'giant' or in a world related to giants.
The giant is the central figure in 'a selfish giant short story'. He is the one who has the big change throughout the story. The children are the other main characters. They are the ones who the giant initially shuns from his garden. Their innocence and joy are in contrast to the giant's selfishness at the start. There may also be some other minor characters like the birds and the flowers in the garden which are affected by the actions of the giant and the children.
The main characters are the selfish giant and the children. The giant owns the garden and initially keeps the children out. The children, on the other hand, represent innocence and joy, and they long to play in the beautiful garden.