Hyota Arakome (新米俵太 Arakome Hyōta ): an extremely nerdy (and comically-drawn) scientist cadet, addressed by all but Kodai -- including his superior officer and senpai Sanada -- as shinmai (meaning "newbie" or "boot", but also being a different reading of the kanji in his family name). Despite his clumsiness, he proves his worth as a scientist and engineer, and in one episode comes up with an idea to use the wave motion gun's recoil as propulsion to save the ship, a concept that even Sanada did not think of. He is killed in the final battle against the Comet Empire shortly after locating Gatlantis's power center.
- Japanese voice artist: Yuji Mitsuya
- Arakome is said to be based on assistant director Kazunori Tanahashi.