Jackson wasn't born with "the look." While a young man, however, he discovered a strange device in the wreckage of a ship. While examining it, he inadvertently activated a long-dormant power source connected to a holographic head. Jackson, deeply superstitious, interpreted this event as the manifestation of a powerful spirit. Jackson would return here with increasing frequency to "commune" with the spirit. This disembodied head, in reality, is a sentient person. During Jackson's séance encounters, he would be given instructions.
Thanks to the efforts of followers who slowly began appearing in Jackson's presence, along with the piecemeal guidance he passes along from his "visions" of the brain, the tribe has set up a surprisingly effective hydroponics system to grow large quantities of punga fruit. This harvest, thanks to Tobar's service as a trader, draws a steady trickle of fresh blood into the area, thanks in large part to the addictive properties of the plant. These entrepreneurs and addicts often wind up inducted as new tribe members.
His health seems to be the lowest among all of the tribals.
Killing Jackson after talking to him will result in no Karma loss. Killing him will not affect the tribals' disposition towards you, making pick-pocketing or killing him okay. This will not affect the quest if you talk to him first.
Killing Jackson as he is talking to the hologram, before speaking to either him or the hologram, will open a different initial dialogue with the hologram.