500
In Avatar: The Last Airbender there are 4 elements that people can bend. Name someone who bends each element who isn't Aang, Zuko, Toph or Katara.
Waterbending: Due, Hama, Huu, Kam, La, Malina, Misu, Noa, Pakku, Sangok, Siku, Sura, Tho, Tui, Yugoda
Airbending: Appa(yes he counts), Jinju
Earthbenders: General Fong/How/Sung, Ghashiun, ShaMo, Poi, Penga, Oma, Morishita, Mater Yu, Long Feng, Kori, King Bumi, Jin Wei, HoTun, Haru, Gow, Shu, Soonjei, Sud, Badger Mole(Counts), Tyro, Xin Fu, Yung,
Firebenders:Any dragon, Admiral Zhao, Bujing, Fire Lord Azulon/Ozai/Sozin, General Mung, Ham Ghao, Iroh, Kiyi, Azula
Would also accept any of the Avatars besides Aang.