Swan Queen

SwanQueen is a Femslash Ship between Emma Swan and Regina Mills from Once Upon A Time.

Canon
In Seasons 1 and 2, Emma and Regina were enemies fighting over custody of Henry. In later seasons, they became allies in order to fight various villains such as Zelena, Hades, and, in season 6, Regina's evil half, the Evil Queen. Said evil half came about via a Jekyll-and-Hyde split.