IT-904 was a droid of the Interrogation droid class, specifically an Imperial model. Dej Vennor, a bounty hunter, acquired it through purchase at an auction. Vennor then proceeded to alter the droid significantly, adding weaponry and rewriting its software, all to improve its effectiveness in bounty hunting. A side effect of these programming adjustments was the development of a sarcastic and cynical attitude in the droid.