The Injustice: Gods Among Us demo is live on PlayStation Network and Xbox Live, and with that, so are the accompanying avatar accessories (on the Xbox Live Marketplace).
Accessories for your avatar include Wonder Woman, Superman and Batman shirts, and costumes for Killer Frost and Ares, among others. The latter two aren’t even playable in the game, which makes one think that future DLC could see Killer Frost and Ares make an appearance.
Each avatar costume costs 400 Microsoft Points, featuring every character in the game.
Killer Frost, real name Crystal Frost, is a super villain of Firestorm. She first appeared way back in 1978, with the ability to absorb heat and turn it into ice. Ares is the Greek god of war and one of the Twelve Olympians. The two characters were also spotted about a week ago in a render revealed by the Test Your Might forum.