After news broke of the casting of Hawkgirl in the upcoming Arrow/The Flash Spin-Off series, we also found out that another new character had been cast as well. Doctor Who alum Arthur Darvill has been cast as Rip Hunter. Who is Rip Hunter? Well, he's a time traveler who's looking to get back to his original timeline. He's the character that was described as "The Traveler" when we heard previously about three new characters we hadn't yet seen on live action television.
So we now know who THE TRAVELER and the FEMALE WARRIOR are. All we have left is the MYSTERY HERO, which I'm sure we'll hear about very soon. Now...as to all the wondering about how they'll bring Caity Lotz into the fold? (SPOILER) Her character, Sara Lance, was killed off in the early episodes of this current season of Arrow. My theory...perhaps we're about to get an invasion of Earth 2 characters. Just my theory.
The Spin-Off (no official name yet) will star Brandon Routh, Victor Garber, Wentworth Miller, Dominic Purcell, Ciara Renée, and Caity Lotz and is rumored to be targeting a mid season premiere in 2016.