Reading Anne Lamont's bird by bird, the 50th Anniversary version, I encountered an odd assertion regarding Characters and Plot. She asserts that it's best, when starting a book, to write several pages of the character having a conversation with, say, a shopkeeper, florist on someone on the street. Arguing that the character is more essential than the plot, she then suggests, that if that rendition of the character doesn't fit your story, you chuck the entire thing, finding something that fits them.
While I agree with her about character, that not only seems extreme, but is something I've never heard anyone ever doing, or even consider. So, if the character doesn't fit your interstellar sci-fi Saga, the just write a nice little historical romance for him.
I can't think of anyone who'd take this approach. What seems more common (if it ever comes to it) is to promote a secondary or even tertiary character to the lead role, but that's assuming you've already written most of the story.
Is this something that anyone does, and more importantly, is it something that anyone here may have tried? The issue is, for most authors, we continue trying to force the character into the role we assigned, even if they're unsuited for it, resulting in significant story (or believability) issues later.
Still, that tactic seems so foreign, I'm still trying to wrap my mind around it, weeks later.
So, I guess the bigger question is: do you create a character for each story, or pick the best character from all the people/personality-traits you know, and what would it take for you to kick them to the curb, after writing multiple chapters?
By the way, Anna Lamont's book is excellent, not only capturing much about the writing process, but also accurately recounting the various insecurities authors habitually suffer from (she led writing groups for much of her writing career, despite turning out a large number of books), either providing work-arounds, or at least letting us know that we're not alone.