The following is actually an excerpt from my droid rules set (which I continue to expand upon instead of just finishing. Damn me). Its a nice little bit of RP fluff (I think), and hasn't been done before to my knowledge- so without further ado.. here it is:
Most droids are subjected to regular memory wipes. This ensures that they remain in 'factory condition', focused on their jobs and devoid of any random bits of data that could distract them from their tasks or even corrupt their personalities. Droids who are not given memory wipes may develop one or more quirks. Quirks typical to a design are listed under specific droid types, but below are a listing of some others that may develop. These are intended primarily to give the GM ideas and allow for greater personalization of any NPC droids an adventuring party may have. Any unwanted quirks may be removed by performing a memory wipe or (more selectively) with a moderate (or greater) droid-programming skill roll.
Possible Droid Quirks:
Sings or hums while working
Gets distracted easily (especially by something shiney)
Becomes disgruntled, rude and sullen
Becomes 'depressed'. Works slowly and without 'gusto'
Falls in love with its master. Wants to follow him/her everywhere. May compose poetry to express emotions
Falls in love with another droid, computer, ship, vehicle, random inanimate object, etc.
Considers self an artist. Tries to express creativity through its normal job or by developing an artistic 'hobby'
Logic error. Freezes up occasionally for a few seconds at a time (or a kick or rap on the head will get it going again)
Becomes self aware. Questions its place in universe
Becomes nervous and jumpy
Likes to pinch
Is overly 'helpful', doing tasks nobody asked it to do
Becomes a hoarder/collector of odds and ends(does not steal, just collects unwanted/discarded things)
Voyeur. Likes to spy on master/others
Expels lubricant/gas exhaust when startled
Develops sense of 'humor'. Attempts pranks or tells jokes
Irrational fear of bugs/vermin
Vanity. Obsessed with personal appearance
Discovers hidden programming. Perhaps it has assassin or espionage protocols or a secret mission to accomplish. The specifics are left up to the GM
Spontaneously overrides the three laws of robotics. Note: this doesn't (necessarily) make the droid a 'killer'
Kleptomaniac. Steals/hides items from others
Alpha-droid. Attempts to boss around other droids or even organics
Dancer. Likes to move to music
Addict. Enjoys 'sparking' (using electric shocks to stimulate circuits). Work may be put off or ignored to indulge in this
Bad Tempered. Breaks things when angered
Takes a small critter (or simpler droid) as a 'pet'
Becomes extremely literal in its interpretation of orders