I like Savage World's dx v. 4 (usually), with important characters getting a d6 that is considered separately.

So, if I have a d4 in Fighting, I roll a d4 and a d6, and take the better of the two. My opponent, who isn't a main character, might be rolling a d6, and might have a higher parry, but I have that little bit better chance to succeed because I am Dramatically Important.