Returners FF RPG is a Tabletop Pen-And-Paper RPG based of the video game series of Final Fantasy. This role-playing system has many of the things you may find in a Final Fantasy Video Game, from the races like Humans or Moogles or Viera, to the Summons like Shiva or Fenrir or Bahamut. This system, while having 400+ pages slammed into it's game, is still fun to play.
Another recommendation, if this system is too complex for you, is ZODIAC Final Fantasy RPG. It's rules-lite, but many supplements given on the messageboard allow it to be more versatile then Returners.