The main character is, of course, Fire Girl. She could have a family member in the story, like a father or mother who was also a fire user but disappeared mysteriously. There might be a love interest too, a boy from another tribe or group who at first is wary of her powers but then comes to admire and love her. And there would likely be an enemy, a powerful sorcerer perhaps, who wants to extinguish all fire magic in the world and sees Fire Girl as a major threat to his plan.
The main characters are obviously the fire girl and the wax boy. The fire girl might be a character with unique abilities related to fire, like being able to create or control flames. The wax boy could have his own set of skills or characteristics associated with wax, perhaps he can manipulate wax in some way. They are the central figures around which the story presumably revolves.
I'm not entirely sure, but the girl herself is definitely one of the main characters. There might be some sort of mentor figure, like an old wizard or a wise woman, who helps her on her journey.
Perhaps the main character is a young girl who discovers she has a special gift or mission that makes her the 'girl on fire'. Alongside her, there could be a mentor figure, an older person who has some knowledge or experience that can guide her. And there may be some peers who at first don't understand her but later come to support her in her adventure.
I'm not sure who the main characters are as I haven't read it. But I would assume there is the girl who is 'on fire' as the central character. There might also be some supporting characters like her friends, family members, or enemies who play important roles in her story.
Since I don't know the exact 'Fire Girl' light novel, I can only guess. There would surely be the Fire Girl herself. There might also be a mentor figure, someone who helps her understand and control her powers better. Maybe there's a love interest, a guy who is initially intrigued by her powers and then falls for her personality.
I'm sorry, since I don't know the exact 'Man on Fire' 1987 story, I can't tell you the main characters.
Since I don't know the specific 'Fire Watch Story', I can't say for sure. But it could be the fire watchers themselves as main characters. Maybe there's a veteran fire watcher who is training a new recruit, so they would be the main characters.
If it's the 'The Hunger Games' related 'girl on fire story', then the main character is Katniss Everdeen.
Since I don't know the specific story, it's hard to say who the main character is. It could be an ordinary girl from a small town who did something extraordinary.
Since we don't know the exact 'fire in the sky story', it's difficult to say. It could be about astronomers who witness a strange 'fire in the sky' event, so the main characters would be them.