A fanmade character that is perfect in almost, if not, every way. They generally are unrealistically attractive, virtually every character is their friend or has a crush on them, and are overpowered. Male versions are also called a, "Gary Sue"
"Your OC is a Mary Sue"
by Cassidy Greyson February 12, 2017
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It used to refer to a type of female character who is depicted as unrealistically lacking in flaws or weaknesses.
Now people use to refer to a "Female Character I Don't Like For Some Reason."
NeckBeard: Korra is Mary Sue, the worst avatar ever because she is not Aang.
People: _eye roll_
by xbXrealSlimShadyXdx November 26, 2020
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A dogwhistle term for neckbeards to criticize strong female protagonists, when in reality they're just misogynistic assholes.
Incel #1: "Did you see how bullshit the Night King's death was on GoT last night?"

Incel #2: "Yeah dude! I can't believe they made Arya into a Mary Sue! I wish Samwell Tarly would have killed him instead!"
by Dr. Phil Mike Hunt May 3, 2019
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The most common type of Mary Sue is a character based an the author's idealization of themself. Furthermore, because the author is imagining a preferred version of themself, and because faults are overlooked in favor of optimization, a Mary Sue tends to have only superficial resemblance to the author, sharing similar likes/dislikes and a similar spirituality (when applicable), but objectifying things such as worldview and relationships. This type of Mary Sue is more common simply because it's easier to write and is more appealing to the author. This Mary Sue is found in fanfics and original fiction alike. Yes, Mary Sues abound even in professional writing.

The other type of Mary Sue is a character intended to be an ideal match for another, appearing almost exclusively in fanfics. In this case, "ideal match" means that the character's positive traits are exaggerated to render impossible any competition for the love interest. Arguably more pernicious than the "self-idealization" type, the "ideal match" type by its very nature prevents compelling character or plot development, which the "self-ideal" Mary Sue may be able to avoid.
Self-idealization: "That fic was ridiculous. I could overlook the atrocious grammar, but not such an obvious and annoying Mary Sue. What's the point of releasing a story to the unsuspecting public if it's only written for the masturbation of the author's ego?"

Ideal match: "It's hard to find any other story that's so dull as one that has an ideal match Mary Sue in it. What is there to be interested in if the pair never has any trials to overcome?"
by Aesi January 30, 2008
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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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A girl who thinks she's so pretty and perfect; Girl version of Marty Stu.
Julia: omg girls, Alma is such a Mary Sue
Emma: I know right. She's the reason who Julian broke up with Ingrid
Sophie: Oh no, here she comes. Quick, act natural
Alma: Hi girls, like my hair? It's better than yours
Sophie (muttering): What a Mary Sue
by Betty Jo October 14, 2018
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