Zeta

One of the Mecha Nyanbo who helps Alpha with finding UFO pieces.
Appears as a tank that can be transformed.
Marked with "ζ (zeta)"

It is faithful to Alpha but at 5 o'clock they will go home even while working. Alpha doesn't refer to them by their individual name. They are dissatisfied and have complained about the poor working environment and salary system.

(Source : Wikipedia)