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I'd like to make an amendment to the above. It's entirely possible to have a unique, overly-described character who isn't a Mary Sue, and a character with little to no description who is. There's n...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7438 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I'd like to make an amendment to the above. It's entirely possible to have a unique, overly-described character who isn't a Mary Sue, and a character with little to no description who is. There's no real formula that can exactly pin this down. Those listed above have good points and went over the common tell-tale signs, but here's what I consider to be the real problem: Undue attention. Mary-Sues get the attention of the author for not having done enough. They get the attention of the characters around them for reasons that just don't exist in the story, for good or ill. A character that everyone hates for no good reason is as much of a Mary Sue as one who's universally loved. Anti-Mary-Sues fall for the same sins as what they were trying to protest. Their ego, the author's love of their darling pearl, and private fantasies and wish fulfillment has out-shown the story they were going to write. I'm going to suggest that everyone forget what they know about Mary-Sues, though. Don't think about them. Don't concern yourself. Keep your own ego in check, and try to develop all your characters without focusing on too much on a favorite. Listen when your writing buddies say 'how is she getting away with this?' and find a _good_ answer. The symptoms of Mary Sue-ism will fade, even if you keep the violet eyes and fiery hair. People too afraid of falling into this category can drab their characters down until they're no longer interesting. I've known quite a few writers too scared to let anything interesting happen in their books, crying 'realism!' as if a baseball bat of critical disbelief was going to beat them at any moment. I used to be one of them. And I wrote Mary Sues in my early teens, before my writing matured and I found more interesting things to pursue instead. Keep your work balanced, work hard on your writing, and don't worry about what people have done before. Writing's too much work to spend all your energy scared of what other people might think of you.