How does one go about handling writing from the POV of a character they don't resemble much? For example, let's take me. How would I go about writing a fanfiction from the POV of, say, Cynthia?
Let's look at it like this. I'm a teenage male in high school, used to writing similar characters. Cynthia is an adult woman, in her twenties (or possibly even thirties, game sprites make it hard to tell age), who's a successful professional Pokemon trainer, and works with dangerous Pokemon/animals on a daily basis. How can I get under her skin to write a story narrated by her?
This is only an example of course, not that I'm planning a Cynthia-based fic anytime soon. But the question remains: how can I write in such a style so as to make it more believable to the reader that a real live person is speaking? How to write so that readers will think, "Man, that's no character, that's a real live person,"?
Your advice, tips, and two cents will be greatly appreciated.
EDIT: Apparently, I've been misunderstood. My 'real' question can be seen more clearly two or three posts down.