Shapechanger. The HK-X is able to change shape to adopt any appearance, although its size must remain medium. It has full programming protocols for acting and bluffing, and can also manifest simple melee weapons.
Integrated scanner. Hunter-killers have scanners integrated into their audio/visual sensors. This means that they are always considered to be using a scanner.
Designated target. Hunter-killers can be programmed to destroy a specific target. They will not stop until that target is destroyed. With full databanks of the target's weaknesses, the hunter-killer ignores any SOAK that the target possesses. Programming a hunter-killer in this way takes one day. The HK-TX can maintain a datafile of up to 10 targets.