An original character (fem.) in fanfic or an original story, usually on the internet, who is far superior to all other characters. She is typically beautiful, intelligent, kind, and in all other ways "perfect". She usually serves as an important part in a pivotal plot element (ie: a prophecy) and becomes romantically involved with the author's favourite character in the story. The internet fiction world runs rampant with these characters.
dracosluvur: My character's name is Alienne Raven Jewel Sassandra Moonflower Romance Shimmer Honeybeam, she came to Hogwarts after being separated from her family in the U.S. and sold into illegal slavery in Japan, she's fluent in both languages and is part Fae. She has snow-white skin, black hair and sparkling eyes that change colour. She's tall, thin and busty, she fills in as the Charms professor sometimes and doesn't really have a house because she's just that unsortable so she has her own luxury room in one of the towers. Almost the entire male population adores her, staff and students, and she gets perfect marks and it figures that she is the one who actually kills voldemort.

SatiricalBanshee: AGH!DUCK AND COVER! MARY-SUE!

by SatiricalBanshee February 27, 2008
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Used to negatively describe a female character, usually in a fanfiction (but sometimes in a Tv show or movie,) that can be just be very annoying because they are too perfect or there aren't any/many weaknesses in their personality. If they are a side character, they can sometimes take the spotlight. If they are a main character, it can make an uninteresting story. Sometimes turn into a joke. Also look at Marty-Stu.
This is a prime example of a Mary-Sue that I found on a writers page on fanfiction.

"Michelle Isabella Fenton

Danny Phantom's thirteen-year-old sister, who is two years younger than him. She is Danielle Phantom's identical twin and Nat Wolff's girlfriend. She is a Harry Potter style witch and a Aquamarine style mermaid. Michelle has dark brown hair and aquamarine blue eyes. She is an Avatar style water and airbender. Michelle is 25 percent Twilight vampire, which explains why people think she looks perfect. Her hair is elbow-length and she is 5'3. In her power form, she has a white bikini top, full white knee-length skirt, a diamond on the very center or her forehead near her eyes. In this form, Michelle wears silver sandal heels. Her hair had white streaks in it. Two streaks of hair that are about 3 inches wide are curled and pinned at the center of the back of her head, towards the nape of her neck. Michelle is also very good with arrows.

Personality: Sweet and innocent. Very loving. Dispite how it may seem like an act, Michelle's personality is pure. Can be a bit protective at times, but only for the better.
Aliases: Lena Yue"

Doesn't that character sound kinda annoying?
by Nobody That Important July 14, 2008
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When a girl (preferably Mary Sue Coleman) watches you while you sleep and you suddenly jizz in her face and yell 'SURPRISE' !!
Everyone heard Chris yell 'surprise' when he Mary Sue Surprised the president of the University of Michigan last night..
by kelseykilla October 31, 2010
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The Mary-Sue mothership takes on the same concept of Mary-Sue (or Gary-Stu, depending on the case), but this term stands for both the Mary-Sue and the Suethor who created the Mary-Sue in question.

In this case, however, the 'pairing' between the Mary-Sue and the canon character will have gathered a club of fans who follow the Suethor's every art or literature featuring the Mary-Sue and canon character, of whom would, 99.9% of the time, be turned OOC (out of character).

The Suethor's avid fan club becomes very loyal to the Suethor, giving the Suethor art gifts featuring the Mary-Sue in scenes with the canon character in their own artistic style.

Mary-Sue motherships are more than likely to be found at DeviantART, but some Suethors show off the work of their followers at Photobucket or other image site.

If there is ever a setting where a Gary-Stu character is involved, it is termed the "Gary-Stu Death Star."

The numerous images featuring the Mary-Sue and canon character fighting against the world or having babies can be termed "Mary-Sue motherload."
"Holy crap, I just spotted another Mary-Sue mothership. M-S MOTHERSHIP! TWELVE O'CLOCK!! IT'S HEADED RIGHT FOR US!!"

At the very heart of a Mary-Sue mothership is an insecure individual who is angsty and only wants to elope with a towdally osm fictional character who will marry them, give them babies, and live happily ever after. The End.
by Radiant Chaos April 16, 2010
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A Mary Sue is a term used to describe a original charecter from a story, anime, game, etc. that is unoriginal, stupid, or fucked over in multiple ways. Some things that could get you oc called a Mary Sue: Stupidly dark backstory, overpowered powers (Immortal, Insta kill, etc.), a twenty inch dick, and more.
Person 1: My oc's least favourite thing is her terrible back flashes.

Person 2: FUCKING MARY SUE
by Dyslexic_Apple September 6, 2016
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A female character that is annoying because she is too perfect.
Usually used in RPGs and stories
(RPG) Stop being a Mary-Sue... you have like 102384028 powers already O.o
by ~Shinku~ December 31, 2010
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A gorgeous, athletic, talented and intelligent girl who has every man on earth chasing after her. Even though she is beautiful, she will deny this. Almost always on the good side. If not, she's that overpowered hottie on the other side. Unusually attractive, and is related or in a relationship with any Canon character.
So perfect that it's very annoying.

Used most commonly in RPGs, Fan Fictions etc etc.

Her male counterpart is Gary-Stu or Marty-Stu.

WARNING If you character is named Mary Sue but does not have these traits, the name does not exactly matter. It is okay to give you character the name, Mary Sue.
Fan-fiction writer:
Her name is Celestia Destiny Raven Violet Shimmer Moondancer. She has long raven black hair and beautiful pale skin. Her eyes are a sharp emerald but they change to a glistening red when she is mad. They change blue when she's happy too! She's very curvy and has the best taste in fashion. However she denies all of this and in such a cute, bashful way. She was such a talented witch, that the second she was born, Voldemort hissed in agony. She is sent to Hogwarts at age 6 and secretly trained by Dumbledore until she is old enough to go to Hogwarts. She then gets Draco Malfoy and half of the male population in Hogwarts to go after her. When Voldemort appears and asks her out, she refuses but shakes his out of pity. Then he turns good and we all live happily ever after. The End.

Random Guy:
MARY-SUE!MARY-SUE!
by Muffins4C August 11, 2011
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