I recently came across a lot of questions on Anime and Manga Stack Exchange by this user who is the
curator of an exhibition on Easter Island in popular culture (http://www.moaiculture.com)
I helped him with an answer but then I too was interested in knowing why are there so many references drawn to this place. Similarly Sci-Fi Comics by Korean Authors frequently refer to Jeju Islands.
A bunch of it's appearances are listed here
Why is the Easter Island such a frequent participant in Japanese Comics? Are there any historical reasons for it?