I know there's been many a debate on the subject of whether Supremely Perfect Awesome Sunshine-Farting Princessy Characters who are technically original count as Mary-Sues. My position on this is that yes, yes, they so very much do. In some ways they're even worse, because there aren't any familiar and likeable characters around them to take your mind off them!
Anyone who disagrees?
Read 'A Woman of Quality' by Frances Hodgson Burnett, which you can find for free right here -->
http://www.gutenberg.org/etext/1550 at Project Gutenberg.
Clorinda is quite possibly the Sue-Queen. It starts with her mysterious strength and charisma AS A NEWBORN and goes on from there. Plus, she literally gets away with murder! Because he blackmailed her and he TOTALLY DESERVED IT and her sister (the feeble, plain one who worships her) literally DIES OF GUILT because she didn't turn Clorinda in but she's okay with it! Because Clorinda got a happy ending! With the Superlatively Awesome Earl and their six perfect and brilliant and fearless children and I am seriously not making any of this up.
I read it all the way to the end, waiting for some sort of twist, but... nope. O.O It was *special*.