The ShodaiJira's name comes from shodai (初代?), meaning first generation, and Jira, which comes from Zilla's Japanese name, Jira (ジラ?).
Originally intended to be a redesign for Godzilla, the ShodaiJira is a very drastic redesign, to the point of looking almost nothing like his Japanese counterpart. The CGI model's appearance and stance seem to be based off of that of a tyrannosaurus rex, being hunched over. The color of the design's skin is a very dark blue on the top of his body, to the point of looking black during some scenes, a silvery light-blue color on the sides of the body, and tan on the underside, as if to blend in with urban environment. The ShodaiJira design has a notably big underbite with a huge chin, and teeth which stick out of the mouth, much like crocodiles'. In contrast to Godzilla's maple leaf shaped scutes, the ShodaiJira has curved, spike-like scutes, curving towards the front, described as looking somewhat like reversed shark fins. The design has powerful, long legs and arms, which enable for very swift movement; something it was specifically designed to have.
This design of Zilla, originally intended to be a Godzilla redesign, was made based only on Toho's instructions that the monster had to be quick and agile.
Although Toho had little to do with the making of this design, they still knew what it looked like and nevertheless permitted it.
This is the only design to have been renamed according to the character's official Japanese name. It was formerly known as the "AmeriGoji" or the "98Goji", but was renamed after the Zilla name change.
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