Half-Life 2 Allies:
Gordon Freeman is a one man army that has to stop the combine just like in Half-Life where he stopped the Xenians from invading the Earth. He has a degree from MIT and he used to work in the Black Mesa Research Faciltity in Half-Life.
The G-Man is the boss of Gordon Freeman. He can slow down time and do what ever he wants while everything still in place. He is a mysterious one.
This woman is Eli Vance's young daughter and she is here to help Gordon along his adventurous journey.
Alyx's father and a Black Mesa scientist that helps Gordon along the way. Along his escape from Black Mesa he was injured in the leg.
Barney Calhoun leads the citizens on a rebellion against the Combine and Dr. Breen.
This is the scientist that got Gordon Freeman his job at Black Mesa. This guy is pretty smart and has a degree from MIT.
Dr. Breen is the administrator and is the one who is causing havoc for everyone. He has joined forces with the aliens and must be stopped.
Father Grigori is a man of no fear and does kind of insane. Gordon meets him in Ravenholm (the zombie town) and he gives him a shotgun.
Dog is a mechanical Dog that Alyx's father built to protect her when she was a little infant. Gordon plays catch with it while he throws huge chunks of barrels straight into him.