A character is referred to as a “Mary Sue” if she is either improbably perfect or powerful, if his flaws are superficial and are just used to make him a more attractive character, or if she is a stand-in for the author.
Write a fictionalized version of yourself. Make him or her as powerful and perfect as you’d like. Then, write an Anti-Sue: Yourself at your worst. Finally, fictionalize yourself, focusing on your real quirks, beauty, and failings. Which character would you most like to read about?
They met only once – at the airport, outside terminal 44A. Slipping her smartphone into the pocket of her well-tailored corduroys, she smiled warmly and made way for a woman passing the other way. Flurried, tires bulging through her t-shirt, the woman avoided eye-contact, accidentally knocking a passerby down.
Sighing in frustration, I picked myself up, dusted off and looked up at the faces of two women – one red-faced, apologetic, and the other full of polite concern. Twisting my hair back into a bun, I half-smiled, deciding to let it go. The weather was perfect outside. I grinned, waved, and walked on.