Monoeye

Monoeyes are enemies seen in the Kid Icarus series. They are red creatures with one big eye and tentacles. They are commonly described as "one-eyed ghostly plasmas".

Kid Icarus
Monoeyes are usually seen in groups of four, as they fly down from the top of the screen, hover around for a few seconds, then swoop down at Pit befre flying off screen. They are relatively common, especially in the Underworld.

Kid Icarus: Uprising
Monoeyes are also in the long-awated sequel, Kid Icarus: Uprising. In this game, Pit encounters them both in the sky and on the ground, where they not only float around, they also show projectiles from their eyes. Again, they are usually seen in groups of four.