You may be thinking, "Why in the world wouldn't I want to be a Bender?! This is AVATARRRRR!!!" Well, to each his own, but Non-Benders get their own unique skill types to be trained just like benders. Theirs revolve around weaponry and chi. Non-benders are able to create and use more advanced weaponry than most benders take, since... well a bender doesn't need much of a weapon all things considered. Not only are they able to create things such as electric gloves or prods, they can also create weapons that launch rocks, or flamethrowers to emulate different kinds of bender.
Aside from weapon creation, Non-benders are able to use Chi in a very unique way. Whereas benders use it to control the elements, Non-benders can use it to sense others' location, hide themselves, or even boost their own strength/speed/endurance using chi alone.
Non-Benders also get +100 starting stats and a continuous [non-stackable] 50% discount on all purchased items/weapons.