A tactical jammer has been installed into the chassis of this HK-model Gladiator Droid, allowing it to jam nearby sensor sweeps and render itself invisible to these searches.

An experimental automated repair system has been installed on this HK-model Gladiator Droid, giving it an ability to perform or assist in the performance of self-diagnosis and self-repair of its mechanical systems. This system slows the droid while it assesses any necessary repairs when dealing with heavy damage, and can perform very basic tasks or actions while assessing necessary repairs.

This HK-series assassin has nearly all of its external panels painted a deep and rich red, resembling the color of fresh blood. The few panels that have not been painted red remain a semi-glossy black to help accentuate the tone of the other panels.

HK-89 Assassin Droid has developed a predatory nature similar to those often associated with assassin droids. As a result, HK-89 Assassin Droid will often approach a situation with the mind set of a hunter, and convey their findings as such. This can be disconcerting to others who are unaccustomed to HK-89 Assassin Droid.

Embedded rocket launchers have been installed inside this HK-model Gladiator Droid's chassis and frame, with the multiple ordinance deployable at a moment's notice and capable of damaging a medium sized area.