Characters begin as voices, then gain presence by being viewed in others' eyes. Characters define one another in dramatic contexts. It is often very exciting, when characters meet-- out of their encounters, unanticipated stories can spring.
When I compare novelists to short story writers or very short story writers, I can’t compare them, but one thing for sure, the purpose is different. I think that someone who writes tries to create or document a world. And when you write very short fiction you try to document a motion, some kind of movement.