I'm not familiar with this particular 'kindred short story', so it's hard to name the main characters. However, if it's about kindred in a more general sense of a community or group, the main characters might be leaders within that group or individuals who are at the center of some important event related to the kindred theme.
Without having read the 'kindred short story', it's impossible to accurately name the main characters. But if the story is about a kindred of adventurers, for example, the main characters could be the brave explorer leading the group, the wise old mentor who gives advice, and the young novice who is learning the ropes. Or if it's about a family - centered kindred story, it could be the grandparents who hold the family together, the siblings with their own unique personalities, and the parents trying to navigate family life.