Make a Kingdom character.

Name him Mustang.

Say he's a successful alchemist, and make him specialize in fire and explosions.

Make him a Lieutenant Colonel, have him state his rank at every given opportunity.

Make him tempermental.

Don't look at Full Metal Alchemist, because like, I sooo didn't steal this from there. *whistles innocently*

The second half of your third sentence, and your fourth, actually sounds like something I would like to do.