Visually, it resembles a black, skeletal version of Tengen Toppa Gurren Lagann.
On the same way that Tengen Toppa Gurren Lagann is a manifestation of Spiral Power, Grand Zamboa is a manifestation of "absolute despair".
Despite being an Anti-Spiral machine, it is capable of using drills as weapons; however, instead of having spiral grooves, the grooves are straight from the tip of the drill to its base.
