Whether we know it or not, our minds and hearts are populated by all the characters we will ever need - though we may disassemble them and rearrange the parts into composites for variation.

Developing a character with genuine depth requires a focus on not just desire but how the character deals with frustration of her desires, as well as her vulnerabilities, her secrets, and especially her contradictions. This development needs to be forged in scenes, the better to employ your intuition rather than your intellect.