The creator of a Mary Sue character.
A writer who creates perfect, wangsty, or unrealistically talented characters who have no real personality or depth and often become the center of a fanfiction or original fiction, ruining whatever the plot was, if there was one to begin with.
Me: Damn, this character is a major Sue. I suggest you rethink the so-called 'flaws'.
Hint, hint: being allergic to Sundaes with spiders and pink, radiated vegetables in them from the Amazon at two o'clock in the afternoon is NOT a weakness.
Suethor: OMG!1!!11 ur so MEEN!!!1 i cnt blive u Sed THAt! OMGWTF!!!11 u nd ur rigting SUX BiCH!!1111one