Yuji Hiyama

is a guest character and minor antagonist who appeared in Ultraman Decker. He is the chairman of Scitech Laboratory Holdings.
==Personality==
Hiyama possesses an exceedingly arrogant personality. He is overly confident in the power of science, firmly believing that humanity can challenge the might of nature using scientific prowess and absorb it as his own strength for development. He relies solely on simulated results.
Despite his constant emphasis on using Sphere for the "advancement of human science" or the idea of "symbiosis with Sphere," in the end, he only considers the interests of his own company. He even shifts responsibility for the consequences he brought upon himself and demands that third parties clean up the mess.
==History==
===Ultraman Decker===
During the Sphere's attack on Earth, Scitech Laboratory Holdings discovered a Sphere's corpse on the company's land, which led to the development of a new energy source called "S-Plasma" extracted from Sphere, and the construction of the "S-Plasma Breeder" capable of energy fission and proliferation.
When GUTS-Select investigated the company, Kanata advised them to "consider the risks of Sphere and stop using the S-Plasma Breeder." However, he stubbornly refused, citing the reason that "Earth's technology has been stagnant for a long time, and there are no legal restrictions on owning or using Sphere's corpse." He even insisted that "Earth's progress has been hindered by Sphere, so we should symbiotically utilize Sphere" and challenged, "Then tell me, does GUTS-Select have it a perfect method of defeating the Sphere?" Afterward, he stated that he would proceed to the next office schedule, using the company's conducted perfect simulation experiments as an excuse, and left the scene.
Without the authority to interfere with general corporate policies, GUTS-Select's Kanata and Ryumon could only leave the scene helplessly. However, Hiyama, fearing that TPU might intervene in the company's operations, disregarded the advice of his technical staff and increased the output of the S-Plasma Breeder to 86% in an attempt to control Sphere before it could be fully stabilized. As a result, this move caused the supposedly deceased Sphere's main body to experience a thermal runaway phenomenon, ultimately leading to Sphere's complete revival. Sphere destroyed the S-Plasma Breeder and merged with its remains to become Sphere-Geomos.
Hiyama and the company's employees managed to evacuate the building just before its destruction. However, due to the destructive rampage of Sphere-Geomos and the summoned Spheresaurus, the facilities suffered significant damage, leading to chaos on the scene. Hiyama pressured Kanata and Ryumon to fight back, but his cowardly and selfish attitude earned him Ryumon's rebuke. As Sphere-Geomos and Spheresaurus advanced towards the city, and the aftermath of the battle left the facilities mostly destroyed, causing significant losses to the company's assets.
==Gallery==
===Ultraman Decker===
Yuji Hiyama 1.png
Yuji Hiyama 2.png
Yuji Hiyama 3.png
Yuji Hiyama 4.png
Yuji Hiyama 5.png
Yuji Hiyama 6.png
Category:Ultraman Decker
Category:Ultraman Decker Characters
Category:Human Characters
Category:Male Characters
Category:Civilians
Category:Human_Villains