d is the host for a sentient symbiote, left hand, a wisecracking homunculus with a human face residing in his left palm, who can suck in massive amounts of matter through a wind void or vacuum tunnel. left hand enjoys needling the poker-faced d, but only appears as needed, rarely witnessed or heard by anyone other than d, yet aware of many of d's thoughts and actions. at all other times, d's left hand appears normal. besides providing a contrast to d's reserved demeanor, left hand is incredibly useful, possessing many mysterious powers such as psychometry, inducing sleep, determining the medical condition of a victim, and the ability to size up the supernatural powers or prowess of an enemy, even beyond d's keen senses.