Since I don't know the exact 'kid kaiju story', it could have a young kaiju as the main character. Maybe there's also a brave kid who tries to understand the kaiju and help it.
There could be a variety of main characters in the 'kid kaiju story'. It might be a family of kaiju where one of the younger members is the focus. Alongside the kaiju, there could be a group of kids who live near the kaiju's habitat and they interact with it. For example, a curious boy who is not afraid of the kaiju and wants to learn more about it, and a smart girl who comes up with plans to protect the kaiju from other threats in their world.
Since we don't have much info, we can assume the main character is the girl. There might also be other characters like her family, friends, or people she meets during her kaiju - related adventures.
The protagonist is one of the main characters. But there are also other characters like his comrades who fight alongside him against the kaiju.
I'm not sure specifically what the 'kid kaiju story' is about as there could be many different interpretations. It might be a story about a young kaiju (a giant monster in Japanese pop culture), perhaps its adventures or how it grows up in a world full of challenges and other strange creatures.
Well, in many kaiju - related stories, there is often a young and determined protagonist. In the 'kaiju no 8 light novel', this could be the case too. There may also be an older, more experienced mentor - like figure who guides the main character. And perhaps there are other characters who are affected by the kaiju attacks, such as civilians or other workers, and they could also play important roles in the story.
The main character is obviously the kaiju girl. There might also be other characters like her friends who support her in her adventures. And of course, there could be antagonists such as evil kaiju controllers or other humans who oppose the kaiju girl's goals.
It's possible that there are other non - human characters aside from the monstress kaiju that play important roles and could be considered main characters. For instance, there could be magical beings or other creatures that have a connection to the kaiju. They could be involved in a complex web of relationships and storylines that revolve around the existence and actions of the monstress kaiju.
There are two central characters in the 'the kid and the lion kid story'. One is simply a kid, who could be a human child or perhaps a young goat (as 'kid' can have different meanings). The other is the lion kid, which is a young lion. Their relationship and the events that occur between them form the core of the story.
Izuku Midoriya could be a main character. His determination and growth throughout the series would make him a great fit for facing kaiju. He could use his One for All quirk in creative ways to fight the huge monsters, perhaps by focusing the power into a single, super - strong punch that can knock a kaiju off its feet.
Since I don't know the exact 'submarine kid story', it could be the kid as the main character. Maybe there's also a mentor figure, like an old sailor who teaches the kid about submarines.
I'm not sure as the details of 'the new kid story' are not given. But most likely the new kid would be one of the main characters. There could also be a teacher, a bully, or a friendly classmate.