The Presentation of the Blessed Virgin Mary (as it is known in the West), or The Entry of the Most Holy Theotokos into the Temple (its name in the East), is a liturgical feast celebrated by the Roman Catholic, Eastern Catholic, and Orthodox Churches.

The feast is associated with an event recounted not in the New Testament, but in the apocryphal Infancy Narrative of James. According to that text, Mary's parents, Joachim and Anne, who had been childless, received a heavenly message that they would bear a child. In thanksgiving for the gift of their daughter, they brought her, when still a child, to the Temple in Jerusalem to consecrate her to God. Mary remained in the Temple until puberty, at which point she was assigned to Joseph as guardian. Later versions of the story (such as the Gospel of Pseudo-Matthew and the Gospel of the Nativity of Mary) tell us that Mary was taken to the Temple at around the age of three in fulfillment of a vow. Tradition held that she was to remain there to be educated in preparation for her role as Mother of God.

A Mary Sue (sometimes just Sue), in literary criticism and particularly in fanfiction, is a fictional character with overly idealized and hackneyed mannerisms, lacking noteworthy flaws, and primarily functioning as a wish-fulfilment fantasy for the author or reader. It is generally accepted as a character whose positive aspects overwhelm their other traits until they become one-dimensional. While the label "Mary Sue" itself originates from a parody of this type of character, most characters labelled "Mary Sues" by readers are not intended by authors as such. Male Mary Sues are often dubbed "Gary Stu", "Larry Stu", "Marty Stu", or similar names.

While the term is generally limited to fan-created characters, and its most common usage today occurs within the fan fiction community or in reference to fan fiction, original characters in role-playing games or literary canon are also sometimes criticized as being "Mary Sues" or "canon Sues" if they dominate the spotlight or are too unrealistic or unlikely in other ways. One example of this criticism is Wesley Crusher from Star Trek: The Next Generation.