The Island walkers, or Walkers (the capital letter makes them more mysterious).

 There are those that need social interaction to thrive in society. Then there are the Walkers who just wants you to go away. These lone individuals live mostly on the outer islands, deep inside Raiu.  Never at home in the cities or villages of the “civilized”, the Walker makes their home in the wild. They are masters of using what is at hand and what they find.  Due to their almost feral nature, wild beasts either ignore them or in some cases help them.

They are the very embodiment of “How nature says, ‘Do Not Touch'”
Walker-Description