I know that it's a widely accepted fanon that Alex Mercer can flawlessly impersonate anyone he's consumed, but I'm gonna drop a hot take here: he's actually a terrible actor. He can memorize lines just fine, but he can't convincingly deliver anything except for bland military comms like "Roger that, this is squad delta niner-niner, we are currently en route."
The only reason why Alex was able to get away with his terrible acting while infiltrating military bases in Prototype was because he didn't need any acting skills to accomplish his objective. As long as he appeared "in uniform," used the correct military jargon & followed (or pretended to be following) orders, nobody looked any closer.
Alex never even had to affect any kind of persona (other than basic military professionalism), because his own brand of "terse & constantly on edge" fits right in with the miasma of stressed, exhausted masses that are military personnel on the front lines of war.
In the game, there's an escort mission where Alex has to go undercover as helicopter pilot. I failed that mission SO many times, but I'm actually glad I did because on one of my many retries I got to hear the following line of dialogue:
Mercer (psyching himself up before responding to a radio hail): "Okay, okay. You can do this! Just play it cool..."
This man could be absolutely cooked in any espionage setting that requires real, actually convincing acting skills & not just memorizing all the words/phrases used in military comms.












