just to get this started somewhere.

I'll start by stating the coolest(most bad ass) game character ever made, Sweet Tooth. If you disagree, care to share? he's basically the worst bad ass in the gaming history of "man kind". but i also reckon Dante and Kratos deserves a spot rather high up cause of the pure badassness those characters also represent.
Mr Sweet. Tooth quote.

When they captured me all i could think was, What a waste. All of those people i hadn't killed yet