Hiramechimedes

"Pok-Pok-Ping! And a flash comes to me, Land Pollution Vice-Minister Hiramekimedes!"

- Hiramechimedes' catchphrase when he comes up with a new idea.

Land Pollution Vice-Minister Hiramechimedes is the second-in-command of the Banki Clan Gaiark's army of Land Pollution Barbaric Machine Beasts, serving under Land Pollution Minister Yogostein and a supporting antagonist in Engine Sentai Go-Onger.

History
In the past, Hiramechimedes felt disrespected by Yogostein because he did not acknowledge his brilliance and plotted to kill the Land Pollution Minister to take his place as revenge. However, after Yogostein reached out to Hiramechimedes and offered him the rank of Vice-Minister of Land Pollution, Hiramechimedes accepted and swore loyalty to Yogostein out of gratitude, vowing to do everything within his power to assist his boss.

During the Gaiark's campaign across the Brain Worlds, Hiramechimedes achieved numerous victories over the Engines resulting in them coming to fear him. Hiramechimedes would later come to the Human World to serve under Yogostein again, and also encountered his old foes, the Wing Engines and the Go-On Wings.

Eventually, Hiramechimedes, along with Yogostein and Bōseki Banki, stages his apparent banishment from Hellgaille palace as part of a plan to deceive the Go-Ongers and kill Go-On Gold. However, after the plan is foiled the arrival of Engine-Oh G9, Hiramechimedes refuses to return to Yogostein out of shame and instead spends his long days of calculation for a means to kill the Go-Ongers eventually deciding that the only way to beat the Go-Ongersis with with raw power rather than with intellect. To obtain more power for himself, Hiramechimedes sneaks back into Hellgaille Palace and infuses himself with a hundred times the Bikkurium amount that a Savage Machine Beast needs for "Industrial Revolution", upgrading him into a more insane form called Detaramedes and shattering his mental state with the amout of raw power. Detaramedes later goes to fight Engine-Oh G9 and severely overwhelms them with "Big Industrial Revolution", but Sōsuke's refuses to give up and ultimately manages to overpower and destroy Detaramedes, leaving only the Hacalibur remaining for Yogostein to pick up.

When the Go-Ongers visited a shrine in the woods, they encountered Hiramechimedes' ghost, Urameshimedes, who teamed up with a demon called Bakki from Samurai World. He was later put to rest by another G9 Grand Prix.

Trivia

 * His name is from the Japanese word for "to soil" (汚す yogosu).