Huh, I'm amazed that Batman isn't up there, he's only one of the greatest martial artists in fiction, or Ryu/Ken/Bison/Akuma/insert street fighter character here, stupifyingly enough there are a few characters that even Batman can't beat using all the tricks in the world, Karate Kid and Batgirl (Cassandra Cain) I wouldn't mind having Batgirl's fighting powers, as they have practical uses as well (she can read body language like you read a book, only a lot faster than you can read a book). Out of this list though? Master Chief, he is the most practical fighter.