The GiraMeganuron's name comes from another kaiju's name, Megaguirus (メガギラス?, Megagirasu), and Meganuron, which comes from Meganulon's Japanese name, Meganuron (メガヌロン?).
The GiraMeganuron design was a suit, a puppet, and computer generated all at once. Its color changed slightly between these three being used, but it is generally a light brown. It had green-yellow eyes with no distinction between the sclera and the iris, save for black lines which divided them. The GiraMeganuron has a single spherical eye, as opposed to the ShodaiMeganuron's compound eyes. The design was less obviously segmented than the previous one, but still had black lines in-between segments of the body. The body of the design was much spikier and smoother than the ShodaiMeganuron. Its head had two antennae, and the mouth has two fangs which become more noticeable when its mouth opens. Its pincers resemble that of mantises and Kamacuras, but spikier. The GiraMeganuron has thin feet with claws that are reminiscent of the ShodaiMeganuron, except they have two claws instead of just a single one. The design's back is very smooth, and can be opened.