Disclamer: NO question on this test based off of one sole OC I have seen. It was not made to attack anyone.This test is based on the Mary Sue Litmus Test but modified to be Naruto fandom specific. Answer: A Mary sue/ Gary stu in short terms is a character that is either too perfect, too cliche, too unoriginal, too unbelievable for the series, a self insertion or any combination of the these traits. They are not good and despised by the majortiy of readers. Anyone can make a Mary Sue since they are the easiest and most boring way of creating a fan character. With enough critique and feedback; almost ANY mary sue is redeemable if one is willing to change the character enough.