As a respectable 36 year old man, it would be out of my place to discuss video game characters, but I'll do it anyway. I find it helps me understand more how the minds of modern children work.
I find it easier to list than to describe them in detail, so:
The Helpful Gits
Mario
Sonic
The guy that gets his arse whooped at the end of 'Knee Deep in the Dead' on Doom
Donkey Kong
Master Chief
Luigi
Yoshi
Samus
Abe
Munch
The Bastards
Sligs
Glukkons
Dr. Robotnik
Bowser
George Bush
In case you haven't finished the first episode in Doom, this i the guy that gets killed:
Why I have made this post, I do not know. But, that the way life goes, I suppose.