Dark Zagi is a vicious and cruel villain. He was created by a race of jellyfish aliens called the Visitor with a copy of Ultraman Noa to protect them from the threat of the Space Beast. However, Dark Zagi opposes their goal and the visitors end up destroying their planet so that Zagi can be destroyed at once. This failed, as a result of the explosion, Zagi was thrown into the M7-8 universe and there he took the Ultra Brother hostage as his victim. In the end, Noa came to the Ultra planet to defeat Zagi, but Noa lost a lot of strength because he used the Noa Final technique to seal Zagi back into his universe, due to the side effects of the technique, Noa weakened to The Next and Zagi lost his physical form. due to the technique Noa uses.

The remaining Visitors created Lethe to visit Earth and give their technology to humans so that humans can defeat the Space Beast and with their help, the TLT organization is formed. In 1991, Dark Zagi possessed and killed the mind of a scientist named Hajime Yamaoke and renamed Mitsuhiko Ishibori.

So Dark Zagi page should be made and he supposed to be placed in the pure evil category due to his vileness such as genocide on the Planet Visitor and murdered Nagi's parents. Dark Zagi's page wasn't created at all but most of the Ultra Series villain such as Gatanozoa, Sphire, Empera, Zogu, and Belial have been created.