(originally in fan fiction) a type of female character who is depicted as unrealistically lacking in flaws or weaknesses.
- ‘she was not a ‘strong woman’ so much as an insufferable Mary Sue’
- ‘she has no flaws, and if someone called her a Mary Sue, I'd have a difficult time arguing’
- ‘these novels are high on Mary Sue characters’
1970s from the name of a character in A Trekkie's Tale (1973), a parody fan fiction story based on the US television series Star Trek.