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A beautiful person and the niece of doctor strange in marvel lol

A beautiful girl and the niece of doctor strange from marvel lol and also a frickin BOWL! Not rlly but yes

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."

Rey from star wars

Captain Marvel. Nothing more. Just Captain Marvel

The type of character that is perfect in every way possible. Here's an example of a Mary Sue:
- Young, probably immortal
- Everyone loves them
- Always does everything without flaw
- Probably has magical powers
- Might be a hybrid (often crap like "half demon, half wolf, half princess, half human" because princesses are totally not human /s, and the character is probably written by an 8 year old that doesn't know about the term quarters)
- Has like 6 people after her
- Most likely female
- Only flaws are "clumsy" or something similar
Boom. There you have your very own Mary Sue/Gary Stue.