A robot actor, or character mobility hardware platform, adapted to unleash or provide a wide variety of characters in the physical world. The robot actor enables the often screen-constrained characters to become life-like, interactive participants with nearby people in ways not presently achievable. The robot actor is an untethered, free-roaming robot that is has two (or more) legs, is adapted for high dexterity, is controlled and designed to be self-balancing, and, due to this combination of characteristics, the robot can provide characters with an illusion of life and, in many cases, in correct proportion and scale. The hardware and software of the robot actor will become a new generation of animatronic figures by providing a hardware platform capable of continuously evolving to become more capable through advances in controls and artificial intelligence (AI).