Kate Kane (Arrowverse)

Kate Kane, also known by her superhero alias Batwoman and supervillain alias Circe Sionis, is a fictional character in The CW's Arrowverse franchise of TV series, first mentioned in the 2018 episode "Nora" of the television series The Flash, based on the character of the same name, created by Geoff Johns, Grant Morrison, Greg Rucka, Mark Waid and Keith Giffen in 2006, and adapted for television by Caroline Dries. In this version, she is the cousin of famous superhero Bruce Wayne, living in Gotham City, and becomes a superhero in his absence. The character has been portrayed by two different actresses, Ruby Rose and Wallis Day. In the first season of the Batwoman television series, Rose portrayed Kate; when Rose was fired after the end of the season for "multiple complaints" about her behavior, Day was cast as Kate in a recurring role for the second season, while the position of series' lead was taken over by Javicia Leslie as Ryan Wilder, Kate's successor as Batwoman.

This version of Batwoman has also appeared in other series such as The Flash, Arrow, Supergirl and Legends of Tomorrow, for the Elseworlds and Crisis on Infinite Earths crossover events. Kate is a wealthy individual and aspiring businesswoman, having become the acting owner of Wayne Enterprises after Bruce Wayne disappeared. When she learned that he was Batman, she took up his mantle, operating as the vigilante superhero known as Batwoman. After losing her memory following a plane crash, Kate is then taken in by Roman Sionis, becoming the supervillain Circe.