This is going to sound really weird but I thought that Leo from Miller’s Crossing was really badass.
Jules from Pulp Fiction
Tyler Durden from Fight Club
Randall Patrick McMurphy from One Flew Over the Cuckoo’s Nest
Verbal Kint from The Usual Suspects
Ving Rhames as Marcellus Wallace
Albert Brooks as Bernie Rose in DRIVE
Clint Eastwood in Gran Torino
Ryan Gosling as Driver in DRIVE
and Michael Madsen as Mr. Blonde
The ideal bad ass has a calm demeanor and is only bad ass when needed.
Many Charles Bronson characters fit this.
Paul Kersey probably being the most famous one.
Tom Laughlin as Billy Jack should be mentioned as well
Bruce Lee as Lee in Enter the Dragon
My ideal badass is a guy who loves to humiliate other people, especially with insults, but also with violence, showing them that they are stronger, as humans are also animals and the world is a fucking jungle.
Frank from Thief
1. Samuel L. Jackson as Jules Winnfield (Pulp Fiction)
2. John Goodman as Walter Sobchak (The Big Lebowski)
3. Danny Trejo as Machete (Machete)
4. Peter Stormare as Gaear Grimsrud (Fargo)
5. Joe Pesci as Tommy DeVito (Goodfellas)
Forgot to mention my man Hopper in BV 
Bond. James Bond.
Michael Caine as Jack Carter. Get Carter 1971. Probably followed by 3 other Caine roles.
Alex
Not villains, just guys which can be considered badass mothefuckerzz, they can be heroes too.
1-Alex (Clockwork orange)
2-Ordell (Jackie Brown)
3-Blondie & Tuco (Good, bad, ugly)
4-Montana (Scarface)
5-Jules (Pulp Fiction)
6-Bateman (AP)
7-Machete (Machete)
8-Frank (Once upon a time in the West)
9-Paul (Funny Games, ’97)
10-Joe Pesci in Goodfellas
This vid rules