I'm not sure specifically who the main characters are in Kazansky science fiction as it's not a widely known specific work that I have detailed information about. But typically in science fiction, there could be a brave explorer, a brilliant scientist, or a strong - willed leader as main characters.
In Kazansky science fiction, perhaps there is a group of diverse characters. There could be a tech - savvy engineer who is responsible for fixing and maintaining the advanced technology in the story. And there might be a diplomat - like character who tries to negotiate with different species or factions, and their actions and decisions play a crucial role in the development of the plot.