Here are some specific skins and how to unlock them:
Using community unlockers can sometimes interfere with the "Consume" mechanic or game stability. 4. How to Change Skins Once unlocked, skins do not change automatically. Won't let me us Alex Mercer skin - Prototype 2 - GameFAQs Prototype 2 Unlock All Skins
Several skins are locked behind paid downloadable content. If you are playing the Bundle or Gold editions, these may already be included: Here are some specific skins and how to