In Game Terms the Slisur would be built along a human template. They have beeter night vision than humans but are more easily blindded by bright lights.
A Sliss will generally be very skilled at surviving on his native Slisur. He will be excellent at observing his surroundings and drawing subtle clues from the environment around him. It's rare for Sliss to be comfortable with technology, only a small handful of such people exist.
the Sliss worship their world and personify it. They seek to live in hermony with their mother, and to try to neever offer her insult or injury. THe devotion of this belief various from individual to individual.