For something more uplifting and useful to fiction writers than anything I’m capable of producing today, read this post by Hannah Givens at Things Matter.
“They [well-developed minor characters] indicate that your world is full of real people pursuing their own lives, rather than just painted backdrops for your heroes to pass through.”
Love and respect your minor characters. You never know who’ll turn out to be an important character for some other story. 🙂