The ASN-121 is a fairly uncommon sight in the galaxy. This repulsorlift droid, when seen, can be found in a number of differing venues. Due to its quick speed, some elite courier companies use the standard model to deliver communications in a cylinder that is carried in its frontal chuck compartment. Mostly, however, the droid is employed for more nefarious uses.
The ASN-121 can be easily modified to wield a variety of weapons or tools, like a flame-thrower, mini-harpoon, precision blaster, gas dispenser, fire extinguisher, or various drills and cutters. Additionally, the standard sensor package can be switched out with military-grade spy sensors. Because the droid is also capable of emitting disruptive energy beams, it is often used to bypass various security shields and barriers to get into places thought to be impenetrable. Also, the power converter array, which is used to prevent potentially harmful energy spikes or lulls from the unit's fusion generator, can also double as a self-defensive electroshock device. Added to all of this, the droid's small, narrow profile helps to minimize the chance of being hit from either forward or rear attacks.
Because of the versatility of weapons and items which can be equipped and its small size, the ASN-121 is often used as an assassin droid or spy droid. For this reason, some planetary bodies have outlawed the use of these droids and it has been rumoured that some military groups have used these droids as target practice for elite sharpshooter squads.