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.

The memory databanks have been highly encrypted on this HK-72, preventing unauthorized access from nefarious parties.

HK-72 has had every external component painted a dark shade of matte gunmetal gray, in an attempt to minimize the brightness of external lights and features to better blend into the darkness and shadows in a multitude of environments. The specific color also aids in that HK-72's outer shell is non-reflective.

However, this coating has taken a beating from countless battles and incursions, showing the natural shade of the metal in the form of dents, dings and scratches. Additionally, the tint over HK's photoreceptors has faded from numerous cleanings — especially when having to scrub off the carbon scoring due to blasterfire — to allow the ultraviolet blue shade to shine through.

A retractable blade just over a foot in length has been installed inside this HK-model Gladiator Droid, allowing it to defend itself and perform close quarters melee attacks without the need for an additional weapon.

HK-72 has developed a predatory nature similar to those often associated with assassin droids. As a result, HK-72 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-72.