Zbots are a unique branch of kbots exclusive to Infusion Designs. What separates them from kbots is their use of the True Walk Script (Zbot API) system pioneered by Zodius, that allows for dynamic walking animation to be applied to creations that would normally not appear convincing due to their physical size.
As a result, Zbots can be much larger than normal kbots as well as being more maneuverable, due to the dynamic nature of the animation, keeping a realistic feel on such units. Keep an eye out for future developments in this area, along with the release of the Zbot API allowing any unit maker to take advantage of the system.