Because you like Solid Snake in Metal Gear Series
Red doesn't like to explain herself. She wants her work to do the talking. See them in Transistor.
A fight every now and then makes Dante's life a little more interesting. See them in Devil May Cry.
A genetic experiment engineered to be the perfect assassin, Agent 47 is cold, professional, and lethal. See them in Hitman.
All who live know his name, and all who oppose him shall know Death. See them in Darksiders Series.
NiGHTS is a powerful but childlike spirit who hates being told what to do. See them in NiGHTS into Dreams.
Char is always thinking two or three steps ahead of the enemy. See them in Mobile Suit Gundam Series.
Meat Boy tenaciously throws himself into danger, and when he fails, he immediately gets back up and tries again. See them in Super Meat Boy.
A super-soldier, Master Chief might be more machine than man. And for humanity's sake, thank God. See them in Halo.
Even with the world on the line, Bayonetta is an Umbra Witch who maintains a biting sense of humor. See them in Bayonetta.
An assassin with supernatural gifts, Corvo Attano is the last guy you should frame for murder. See them in Dishonored.