: Available via the Excessive Force Pack .
: Skins like Test Subject or Blackwatch infantry reflect how both Heller and Mercer were viewed by Gentek and Blackwatch: not as men, but as weapons or biological assets to be cataloged and deployed. PC Players: Unlocking Issues Prototype 2 Unlock All Skins
If you have the or the Colossal Mayhem/Excessive Force DLCs, you gain access to unique "Skins" under the Rewards tab: : Available via the Excessive Force Pack
Fully Possible via Modding.