As I don't know the exact 'can can story', it's hard to say. But if it's a story about the can - can dance, there might be dancers as the main characters. There could also be a choreographer, an audience, and perhaps a manager of the cabaret where the dance takes place.
Based on the title, the main characters are likely the man and the can. The man is probably a human character who has some sort of interaction with the can, which is an inanimate object but could be central to the story.
I'm not sure without more context, but it could be two beer lovers. Maybe a guy who works at a brewery and a girl who loves collecting beer cans.
I don't know the exact 'we can be heroes story', so I can't say for sure who the main characters are. They could be regular people like a school teacher, a construction worker, and a young student who all find themselves in a situation where they need to be heroes.
I'm not sure specifically as the 'if i can dream' story can have various main characters depending on the version. It could be a young dreamer, an old person with an unfulfilled wish, or a group of people united by a common dream.
I'm not entirely sure as the story isn't widely known to me in a very specific sense. But generally, there would likely be the people who can fly. Maybe there are leaders among them who guide the others in using their flying ability.
As I said before, if it's about the Wright brothers' story, then Orville and Wilbur Wright are the main characters. They were the ones who worked hard to make the first powered flight possible.
As we don't have much information about the 'tin can holler story', it's hard to determine the main characters. But thinking about it, it could be an inventor - type character who comes up with the idea of using a tin can to holler for a specific need. Or it could be a family where a child invents this tin can holler thing and then the whole family gets involved in the story, either by being amazed, helping out, or causing some kind of problem related to it.
Since I don't know the specific 'can of peas theft story', it could be a thief as the main character, perhaps a poor person who steals the can of peas. And there might be a victim, like the owner of the can of peas, whether it's a store owner or just someone who had the peas in their possession.
The main characters are clearly the bully and the can queen.
Maybe it's a group of kids. You know, in a story like this, kids are often the main characters when it involves something as active as kicking. They could be playing in a park or a schoolyard, and the whole story revolves around their interactions and the 'Can I Kick It' situation.