Since the story isn't fully known, the main characters could be a diverse group. There might be a young boy superhero who can turn invisible. There could also be an older, more experienced superhero who has the power of flight and serves as a mentor to the others. And then there are likely other superheroes with powers like super hearing, super flexibility, etc. who all contribute to the overall story.
One main character could be a young superhero who has just discovered his powers and is trying to fit in at the school. Another could be an older student who has been at the school for a while and is a bit of a rebel. And there could be a character who doesn't seem to have any powers at first but later discovers a hidden power within. These characters would interact, learn from each other, and face various challenges in the 'School for Superheroes Story'.
The ten little superheroes might have various adventures. They could be on a mission to save their city from a powerful villain. Each superhero would bring their unique power like flying, super strength or invisibility to the task.
Typically, the main characters are the baby with ten little fingers and ten little toes, and the parents or family members who interact with the baby.
Since I don't know the exact 'ten little lights story', it's hard to say. But it could be that the ten lights themselves are the main characters.
The main characters are of course the ten little monsters.
The main character in the 'ten little fingers story' is usually a little one, perhaps a toddler or a young preschooler. This character is the focus because the story is all about the relationship between this individual and their ten fingers. They are the ones who will touch things, count with their fingers, and have all kinds of little adventures with the help of their fingers.
The ten pirates are the main characters, of course.
The ten Indians are the main characters, each being a part of this mystery.
Since it's about crazy superheroes, the main characters might be a diverse group. There could be a superhero who has the power to control time in a really erratic way, like sometimes he speeds it up for everyone but himself, and sometimes he freezes it accidentally. Another main character could be a female superhero who can communicate with animals but they always give her really confusing advice. And maybe there's a hero who is super strong but also really clumsy and his clumsiness often gets in the way of his heroics.
The main characters are the ten little monkeys.