Ray Palmer's cousin

This Unnamed Character is the cousin of Ray Palmer / The ATOM and possibly the doppelgänger of Kara Danvers (Earth-38).

She is mentioned by Ray when he sees Kara in her civilian outfit. He mention to Sara Lance that Kara looks a lot like his cousin.

Trivia

 * This is a reference to the movie Superman Returns where the role of Superman is portrayed by Brandon Routh, the actor who portrays Ray Palmer in Arrowverse. Supergirl is of course the cousin of Superman.