Fighter of all time? No criteria, no judgment, just your favorite. I'd likely say Cro Cop. Some of the best striking to ever come through MMA IMO and not half bad ground game, and always a very classy, very respectable man. 
Chuck hendo n bj close behind
Benny Urquidez will always be my favorite fighter of all time. Not only was he my coach in my early years but a hugh inspiration in my life
Bill Wallace was a big influance and a favorite fighter
Mirko Filipovic is my favorite MMA guy