Shall I compare her to 'real' characters?
Mary Sue is more precious and perfect.
All the boys at Hogwarts desire her:
Helpless against the allure she projects.
Often her hair is as the raven's wing,
Glossy black with ruby glimmers it shines.
Other times she's a blond angel that sings:
With a voice, like her figure, so divine.
The transfer student with latent powers,
Who masters complex magic from the start,
Always saves the day smelling like flowers:
Defeats Voldemort or dies winning hearts.
A dream of a girl too good to be true;
Sugar coated poison is Mary Sue.