The key features include the adjustable lounge/chair, anti-gravity seat for the pilot's Chao partner, and the magnetically mobile limb lock mechanisms. Once mounted to them, the pilot's actions give them full range of movement with which to do battle against the Umbral Remnants. Their freely moving maneuverability also allows for proper position readjustment when necessary. Most usefully when the pilot engages in the act of 'Soul Bonding' with their Chao.
(Note: Acts of intimacy are to be expected when engaging)