Well, the main characters are, of course, the strange little girls. Each girl has her own distinct personality and backstory.
The stories may also touch on themes of identity. The girls in the stories are 'strange', which implies that they are different and on a journey to discover or assert their own identities. And power is also a possible theme, as these girls might possess unique powers or ways of influencing the world around them.
Another theme could be the power of the marginalized. The strange little girls are often on the outskirts of the 'normal' world in the stories. Yet, they possess a certain power, be it magical or just the power of their unique viewpoints. This challenges the traditional power structures in the stories they are a part of and in the overall literary context.
Gaiman's writing style is often very descriptive. In 'Strange Little Girls Stories', this helps to bring the strange worlds and the unique girls to life. We can vividly imagine their appearances and the settings they are in.
In Neil Gaiman's short story, the approach to talking to girls might involve being genuine and showing interest in their thoughts and feelings.
There are often misfits and outcasts. These characters are on the fringes of society, either by choice or circumstance. They might be loners, like the boy in 'The Graveyard Book' who grows up in a graveyard among the dead. Another type is the curious explorer. These characters are not satisfied with the ordinary world and are eager to discover the hidden, magical aspects of the world around them.
The main characters include Tristan. He is kind of an ordinary guy at first but grows throughout his adventure in the magical land. Yvaine, the star, is a very important character. She is beautiful and has her own powers. Captain Shakespeare is quite interesting too. He seems tough on the outside but has a soft heart. He helps Tristan in many ways during his journey.
Death is also a major character. She is a very different take on the concept of death, being a kind and almost - friendly figure who helps guide souls.
As I haven't read the story, I can't be sure about the main characters. But it's likely to have a character who discovers the genie, perhaps a person in a difficult situation like a poor or desperate one. And of course, the genie itself would be a major character with its own personality, powers, and maybe a bit of mystery.
The main character is Coraline herself. She is a curious and brave girl. Then there's the Other Mother, who at first seems appealing but is actually very sinister. And there's also the cat, which is a rather mysterious character that helps Coraline in her adventures.
Since Neil Gaiman likes to blend different elements in his stories, the main characters in the Holy Grail short story could be a diverse bunch. There might be a young and curious protagonist who stumbles upon the legend of the Grail and decides to embark on a quest. There could also be some sort of guide figure, perhaps an old hermit who has some knowledge about the Grail's whereabouts. And maybe there are antagonists too, like those who would use the Grail for their own dark purposes and oppose the main character's search.