It's Metamorpho. But it is confirmed that Gunn is also bringing in a blond haired, blue eyed Supergirl, Hawkman, Hawk Girl, Shazam & Green Lantern VS. Bizzaro, Lex Luthor, Brainiac, Croc & Joker to round up the Justice League and the Legion of Doom both teams later on combining with the existing big screen heros and villains for a huge showdown. I know all of this because I have a friend on set that took me to some filming and I got to see all of this. Eat your heart out Marvel!!!