Dead Rising 2: Ninja Theme Pack DLC
The Ninja pack will make you harder to detect, increase damage of sword style weapons, make you harder to grab and take down, and increases thrown weapon damage as well. You will gain a new skill while using swords as well.
The Ninja Theme Pack is set to be available on November 3rd, 2010 for the consoles, but I don’t believe a release date has been announced yet for the PC version.
Note that even if you don’t download this pack, you’ll probably want to download the free compatibility pack so that you can play online coop with others that do have it.