Ryusei Tsurugi

Metalder (メタルダー) is a "Choujinki", a powerful war android built by Dr. Koga at the end of World War II originally as a countermeasure against the Americans. He was hidden in a secret base of the Japanese Imperial Army until Dr. Koga activated him years later to fight the Neros Empire. His human guise, Ryusei Tsurugi (剣 流星), is directly modeled after that of Dr. Koga's son Tatsuo of whom he lost during the war. Whenever his energies reach a peak from rage, with the cry "Ikaru!" (怒る!), he transforms into his metallic form. Like Tatsuo, he loves music and plays the saxophone from time to time. His Reflection Circuit gave him the same feelings as humans and a sense of right and wrong. Powered by 'super-gravitational energy', his killing techniques include "Laser Arm", "G-Kick", "Metal Tornado" spinning kick, "Head Crash" ram, "Plasma Punch", "Metal Bomber" punching attack from above, And "1000 Hand Punch". At the end of the series he defeats God Neros but in the process, his super-gravitational energy is greatly damaged, as a result whenever he moves longer, he will explode and the world will be destroyed by its impact. With Kita's help, Metalder is spared from destruction, but at the cost of his human form and his ability to fight as a Choujinki.

In a stage show where the are seen fighting usual foes, Armored Army and  show up and wind up defeating them. Metalder and arrive and assist the Maskman.

In a stage show where the Maskman are seen fighting, Kamen Rider Black, Metalder, Spielban, Shaider, , , , , , and arrive and assist the Maskman.

In a stage show where the are seen fighting their usual foes,, , Underground Empire Tube, Armored Army, and The Sorcerers Clan show up and wind up defeating them, Kamen Rider Black, , Jiraya, Princess Ninja Emiha, , , Metalder, Red Flash,  and Change Dragon arrive and assist the Liveman.



Arsenal

 * Silver Carcass
 * Side Phantom
 * Metal Charger

Portrayal
Ryusei Tsurugi is portrayed by Seikō Senō (妹尾 青洸) (credited as Akira Senō (妹尾 洸)), who also portrayed Tatsuo Koga. As Metalder, his suit actors were Kazuyoshi Yamada (山田 一善) and Noriaki Kaneda (金田 憲明).