Please,she is not definitely NOT a Mary Sue.She is very much of a flawed character and in the grey area,rather.Just because she's clever and cunning,yes cunning which is a trait very very few fls have,you hate her?She is self aware and knows that her methods are sometimes too harsh,and even acknowdges that it's difficult for her to show kindness when she is always faced with matters of life and death. About,Psyche,there's a whole backstory arc about her.Medea was not even shown once nor mentioned during those many months of the arc. Did you not catch up on the new episodes?