Gekko 5105



Moon Rabbit



First Appearence

Kaguya Arc

Gekko served as a secondary antagonist in the Kaguya Arc of the Yaiba series.


He was at first a part of Kaguya’s invasion force on Earth a thousand years ago. However, he was defeated by the original Ryuujin and lost his right eye. During Kaguya’s 1000-year slumber on the Moon after her defeat at the hand of Ryuujin, Gekko created havoc on the Moon but was captured and imprisoned.

A thousand year later, Kaguya launched another invasion on Earth, facing Yaiba, who inherited Ryuujin’s powers. After discovering that she can return to her true primal form by sucking the extract of Sayaka, Yaiba’s friend, Kaguya had Gekko freed from prison and ordered him to capture Sayaka, promising him the entire Japan. 

Gekko raided the Mine residence to capture Sayaka, but despite proving superior to other Moon rabbits, Gekko was overwhelmed by Yaiba’s Ryuujin-ken. He then raided Area 666 in Kaguya’s base, taking the terrifying Demon King Sword. With this sword, Gekko proved too powerful for Yaiba and later even the combined powers of Yaiba and Onimaru. It took the duo a newly-developed technique, the Furaijinha, to defeat him. Gekko later fused with other Moon Rabbits into a being that in turn fused with True Form Kaguya into a being that in turn fused with Earth. Kaguya and all her henchmen, Gekko included, were eventually sealed into the planet’s core by Yaiba. 

After the event of the Yamata no Orochi, Kaguya and all her underlings returned to the Moon, hoping to restore it back to a beautiful planet. 


  • Gekko Appears
  • Maoken vs Ryuujin Sword
  • Gekko vs Yaiba Second round
  • Club: During his first raid on the Mine residence, Gekko used a club that resembles the tool used by Japanese to make mochi (a traditional food) on New Year event. This club has alternate modes such as bazooka or spear. Gekko can also use this to release blob monsters that resemble mochi. These monsters separate into independent beings if they are cut into pieces and are used mostly to immobilize the enemy by sticking themselves to him.
  • Demon King Sword (魔王剣 Maoken): A sword of terrifying power originally created by Kaguya to protect the Moon, but its power proved too much, resulting in the current un-inhabitable state of the Moon and thus the sword was secured in Area 666 of Kaguya’s base. After his first attack on the Mine residence failed, Gekko intruded Area 666 and took the sword, and with it he easily overpowered Yaiba with the Ryuujin-ken. This blade can turn the evil spirit of the user into energy attacks.