Keiji Uraga

Keiji Uraga (浦賀啓示) is the main antagonist of Kamen Rider Build NEW WORLD: Kamen Rider Grease who is able to transform into Kamen Rider Metal Build (仮面ライダーメタルビルド). He becomes the new leader of the terrorist organization Down Fall after killing Simon Marcus.

Character History
Keiji was a scientist who teamed up with Shinobu until he demised as Zebra Smash like many of previous Smash experimentation victim. During the Killbus incident, his memory returned and had his old wound back like many others previous victim in the New World. After Keiji remembered the incident of the previous world, he took his goal which he couldn't accomplish before, becoming the "ruler of the world" by creating a terrorist organization and facade his leadership by using Simon Marcus as the fake leader of Downfall.

Keiji ambushed the Prime minister building during Taizan, Shinobu, and Gentoku's introduction to Simon Marcus about their weapon to protect the city, Build Driver. Taizan and the others were unaware about Simon's status as Downfall's member. During the ambush, Keiji had changed the group into Phantom Smash and prepared a bottle to absorb all Hazard of the riders so none of them could transform with Gentoku as the first victim and the latter, Sento and Ryuga. After Keiji obtained the proto Build Driver and the Hazard Trigger, he killed Simon as he no longer needed him. Then, he got an information that the Hokuto Three Crows alongside Grease were still able to transform because their Hazard couldn't be absorbed. Keiji interested in this and faced on the Three Crows when he targeted Misora as he didn't know that Misora has no Vigne within her. By becoming Metal Build, he easily defeated the Three Crows alongside Grease despite he late arrival and took Misora with her, not before he told Kazumi to bring him the White Pandora Panel.

Later he had Kazumi come with the White panel and faced Kazumi's Grease Blizzard and was defeated instead. However, Keiji used underhand method on calling a Phantom Smash to hit Grease from the back. He took the White panel and absorbed it alongside a Phantom Smash close to him, becoming Phantom Build. As Phantom Build, Keiji gained a great upper hand, even when Kazumi later gained the power up from Ryuga to become Grease Perfect Kingdom.

On the last moment of the fight, Keiji underestimated Kazumi's determination by mocking him as a weakling who rely on the others while Keiji with White Pandora had become the strongest of all. The provocation angered Kazumi and it raised his Hazzard Level and made Kazumi able to use the true potential of the Perfect Kingdom. With the complete defeat from Kazumi's Perfect Farmer Finish, Keiji mourned by asking on how Kazumi got stronger with Kazumi replied that Keiji had nothing for to fight, much to his demise as he died by turning into a particle light.

Kamen Rider Buttobasoul
Phantom Build is a playable character in Kamen Rider Buttobasoul.

Personality
Keiji Uraga is a power hungry man and used any method to achieve his goal much like any higher ups of Faust during the previous world. He is very sensitive to be called either number two or he is inferior to the one he faced as it would driven him mad, albeit he didn't show his anger brightly. Upon utilizing plan, Keiji is calmed and cautious, and whenever his phased worked splendidly, he would smirked in satisfaction before his final goal had been reached.

Devices

 * Build Driver - Transformation device. Stolen from Shinobu Katsuragi.
 * Fullbottles - Transformation trinkets.
 * Hazard Trigger
 * Pandora Panel (White) - Used to transform into Phantom Build along with Phantom Crusher.

Weapons

 * Drill Crusher

Portrayal
Keiji Uraga is portrayed by Tamiyasu Cho (趙珉和).

Appearances

 * Icon-build.png Kamen Rider Build
 * Kamen Rider Build NEW WORLD: Kamen Rider Grease