In Dead Rising 2: Off The Record for the PC, PS3, and Xbox 360, the psychopath costume will not only make you look scarier, it will also you to do more damage with hacksaw movie type weapons (machetes, chainsaws, knives, cleavers, etc.). Secondary attacks will also have different animations, and you will take less overall damage.
Psychopath Boots – In the Fortune City Arena security room, accessible after case 1-3
Psychopath Clothes – Defeat Carl in the Mail Order Zombrex mission
Psychopath Hair – Watch the Time Share movie at Paradise Platinum Screens on the Platinum Strip between 12am and 2am
Psychopath Mask – On a pew in the Wedding Chapel on the Silver Strip