Old Coot
The Old Coot is a character living in The Badlands. He's supposedly Parker. The Old Coot is invincible and cannot be killed by normal means (gunfire, explosions, melee etc.). However, you can kill him by somehow knocking him into the huge hole that Mohole is named for.
Because Parker was 20-odd years old in the original Red Faction, and Red Faction: Guerrilla takes place 50 years after the original game, Parker is around 70 years old in RF:G.
The Old Coot is usually found sitting down in a chair outside of his house, though he can be sometimes found walking around in the immediate vicinity (near his house), and along the ridges of the giant hole.
He has some Singularity Bombs in his house - always useful for destruction.
Old Coot makes numerous references to the original Red Faction. Some of these references are listed below:
"I miss 'em all... Yes, I do... Eos, Hendrix, Orion... Hell, even Gryphon. They're all gone now... I'm all that's left. Me, and my memories."
"Ultor's behind the plague. And it's all Capek's fault! He's the head of Ultor's science and medical labs on Mars. They've been runnin' some experiments."
"Parker! Clean up this area! Parker! Send the launch signal! Hurry Parker, run Parker, PARKER, PARKER, PARKER!"
"Eos had that thing on her face. Every time I looked at her I thought, 'What the hell does she got under there?' Maybe it was wires? Or warts?"
"50 years I've been sittin' in this chair, and I'll be sittin' here for 50 more!"
"Crazy Parker they called me, crazy Parker, I ain't so crazy, I just get a little exited, that's all"