From the introduction:
[Super Mario RPG uses] simple mechanics based on D6s, low numbers, and a Stat-system based on the Mario game series.
Players take on the role of intrepid souls exploring the world, be they wanderers, soldiers, adventurers or anything in between. As mentioned, the game is designed to be stupendously simple, just like the Mario games themselves. The game is also meant to be highly customizable, permitting many more different templates, characters, items and so forth than are shown here.