Nightow, Vash's creator, has stated that every one of his characters projects a "certain part of [him]", but in a way, Vash is the one most closely identifies with, saying that Vash represents his determination and some of his more-childish side [REF].
When asked why Vash was made to be such a pacifist, Nightow explained that he always felt strange how people are always dying in action movies.