I'm trying to figure out the name of a movie I saw on netflix a couple of years ago. The main character always has a casket on his back and there is always a little girl by his side. In one scene they are sitting at a bart and the little girl keeps stealing the guy sitting next her's whiskey drinks..

("live action anime"?) not quite sure what you mean, but possibly this?
(does the casket hold weapons?. )

Gungrave - Internet Movie Firearms Database - Guns in Movies, TV and Video Games (http://www.imfdb.org/wiki/Gungrave)