Tamao

Tamao is an eyeball-like enemy that protects Dragonzamasu in World 2-3 of Super Mario Land. It bounces diagonally to different parts of the screen, damaging Mario if it touches his Marine Pop. Tamao is completely immune to torpedoes shot by the Marine Pop. However, once Dragonzamasu is defeated, Tamao disappears as well.

Super Mario Land

 * 3DS Virtual Console manual: "This indestrucible life-form guards Dragonzamasu."