Most Badass Dudes in Gaming ?

[Turbo Kid]

Zero

I mentioned Sypha in the female thread, so I'll add Alucard and Trevor for this one. They are all badass

Batman

Welkin Gunther - Valkyria Chronicles

Emile and Freddie - Valiant Hearts the Great War

 

[iisoide]

Gordon Freeman

 

[ScarecorpsE]

Kratos, the old one

 

[Crashbandi]

I've always loved me some Marcus and the gang.

 

[pHoeniX_WRIght]

I'm surprised no one mentioned my man David yet, the man who makes the impossible possible

 

[stealthRUSH stealthRUSH]

 

[Turbo Kid]

Max from Mad Max

Double H from Beyond Good and Evil

Zengetsu - Bloodstained series

Gideon Starling

 

[semyaza]

 

[EnthusiastGuy]

Has to be Tyrael. Although, in my humble opinion, his character was almost intentionally left rather undeveloped, the force and determination he evokes make him a definite bad-ass.
I'm surprised he was not featured in any recent Mortal Kombat game.