Okay, now let's discuss every character that was in the video. Here's a list of ones I KNOW of....
Nathan Drake from Uncharted
Cole MacGrath from inFamous
Solid Snake from Metal Gear Solid
Sack Boy from Little Big Planet
Portal Girl from Portal
Athena & Kratos from God of War
Little Sister from BioShock
Ratchet from Ratchet & Clank
Ezio from Assassins Creed
a Chimera from Resistance
Here are the ones I'm not sure about:
Army of Two
Clown from Twisted Metal
Anything I missed? I know there is... finish the list!