I gotta say that the finest warrior in fiction IMO has to be Daredevil. The word warrior means someone who fights a war(on the guilty in this case), who never quits and who fears nothing and no-one. He's schooled in the martial arts eastern and western and is the finest non-super enhanced athlete.He may not be able to beat everyone but he would die trying and never backs down, never thinks twice about taking on a challenge thats too big for him. In the last DD issue he was about to face a 100 yazuki gangsters with swords armed only with his trusty billy-club(s)/staff and was gonna face 'em no matter what. He is truly fearless and in my opinion a true warrior.