This blog is self-consciously specific, and it only has two posts. But it’s still awesome. It even mentions the hammock blog!
http://dudekazoo.wordpress.com/
Since there are only three characters mentioned on the Video Game Facial Hair blog (Barrett and Mario and Luigi,) I’m going to take the liberty of adding three of my own.
The dwarf from Golden Axe II:

RISE FROM YOUR GRAVE! Wait, wrong game.
This little kicker of elves had a majestic though stereotypical dwarven beard. This is the kind of beard they give you when you reach Valhalla.
Gordon Freeman from the Half-Life series:

Bearded berzerker
Who could forget the beard of Gordon Freeman, the hapless scientist who is forced to kick ass with a crowbar after an interdimensional resonance cascade at Black Mesa Labs unleashed an invasion of alien parasites?
Gordon’s neat Van Dyke says “I am a geek” as well as “I am a sociopath,” perfectly summing up this lone wolf’s character.
Of note, an early version of the game had Gordon looking like a deranged UNIX administrator with his massive, massive beard and powered armor. I actually think this one is better:

Ahahahahaha
Groove Champion’s stache in Interstate 76

Right on
The awesome 1997 driving combat game Interstate 76 was one of the first to render its characters in 3-D. With only a few precious polygons to render the main character, Groove Champion, the designers used most of them to create his fantastic mustache. I belive this decision is what made the game a success.
