Ultimate Ones (原初の一（アルテミット・ワン）, Gensho no Ichi (Arutemitto Wan)?, lit. Primordial One (Ultimate One)), also known as Aristoteles (アリストテレス, Arisutoteresu?) by the humans of the Land of Steel or Types (タイプ, Taipu?), are the eight ultimate lifeforms from other heavenly bodies, embodying the will of the planets themselves. Type Moon, while not active at the same time as the others, is also considered one.