Monster Rancher 4: Designed as a Zan prototype, it still has many of the original features of its robot beginnings. But it's unreliable, and once it runs wild there's no stopping it. Monster Rancher DS 2: My Monster Rancher: It features a square head and green body color. The trouble is that because of their color they really look like insects. Among the Zan species it has some of the best abilities.