You've heard of rock, paper, scissors, but have you heard of slug, frog, snake? That old man you're trying to rob who lives in the mountains by himself has. Hope you like everything being covered in slime.
Apparently these characters were reimagined for the manga/anime Naruto, but I haven't seen Naruto, so please don't sue me, people who own Naruto.
The creature is Jasconius. The island that will eat you.