Gordon model from Valve's HL2 Survivor arcade game.
Always wanted to see Gordon Freeman pay Aperture a visit.
This model is Valve's closest thing to an official model of Freeman himself, his face is compiled of their resources. HEV suit is by ROMKA and the texture/normal map is by dpfilms.
I DID NOT COMPILE THIS MODEL! Just applied the proper animations.
To install, go to:
C:\Program Files (x86)\Steam\steamapps\common\Portal\portal\custom
Note that if the "custom" folder isn't in your directory, just create the folder.