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A Mary Sue is a seemingly perfect character. Their male counterpart is a Gary Sue or a Marty Sue. They have little to no flaws. Often times they have a tragic backstory, being abused, abandoned, etc. They are unrealistically attractive, and often times have things that break cannon severely, such as a Pokémon girl being a Neko. They often have powers that are given to no others in the universe, and that have nothing to do with the universe. They often have long names, often times having 'Kawaii' or 'Desu' or simple Japanese language within them.
Often times they are dating a cannon character, and often times replace a cannon character.
"Your OC is a Mary Sue!"

"Yeah, my old OC was named Shi. She was a Mary Sue."

"Here's my OC, Kristina Jose Marky Trinity. Please don't say she's a Mary Sue."
Mary Sue by glibmonster July 30, 2017
Related Words
sue suede suey Sue-Ann Sueda Suelo Sue me! SueAnne Suel suella

how sue c's it! 

Sue Sylvester from glee gets a segmant on the news called sue's corner and at the end of each segmant she makes a c with her hand and says "And thats how sue c's it"
After voicing opinion* "And thats how Sue c's it!"

Kailee Sue Scott 

WORLDS BEST PERSON!!!!!!!

Another definition of HBIC!
Don't you guys just LOVE that Kailee Sue Scott chic!!!!
What a babe!

Mary-Sue 

A sexist term used to enforce the misogynistic ideals that female characters/authors shouldn't be allowed to fantasize or write anything along the lines of wish fulfillment. Its misogynistic qualities are exemplified in many ways, most notably being the fact that it's not a term dominated by the male counterpart despite existing in a patriarchal society, as well as the fact that the male counterpart is largely undecided upon in name and also undefined (see urban dictionary's Gary Stu entry which has no definition but to say "A Male Mary Sue", and the Marty-Stu entry which involves the "Mary Sue" definition to define it).

It's usually used on the whole to bully new authors out of writing female characters altogether, making the task seem so daunting to some that they now only write slash fictions with two male characters, also exemplifying the misogynistic qualities this term involves.
1.

Fan Fiction Reader: Why don't we just call all bad/annoying characters "special snowflakes" instead of using a female name like mary-sue in a derogatory fashion?

2.

Troll: You're writing a mary-sue to pair with the canon character you fat low life, it's pathetic and so are you!

3.

Author: I'm so afraid of having my female character labeled as a mary-sue that I only write male characters!
Mary-Sue by urmamason May 24, 2013
A Mary Sue is often a perfect female character, with no flaws, a sad backstory, and the story often revolves around them. They often have impossible bloodlines and names like Ebony Dark'ness Dementia Raven Way and they completely upstage canon characters. The other characters are also commonly friends with or in love/crushing on the her, despite not having any reason to.The male counterparts are Gary or Marty Sue.
"Ebony's name is Enoby not Mary Sue"
my immortal
Mary Sue by Blue Flaming Wolf February 23, 2019

Peggy sue 

The name of a cat who has kidney problems and is most likely going to die...
I'm sorry I can't go to the mall with you, I have to attend my cat Peggy sues funeral.
Peggy sue by Flashlight man June 14, 2014