The Legendorga are the monsters who serve the Legendorga Lord Arc in his attempt to take over the world. But their plan failed because of Fangire Race and the first Kiva who destroyed Arc's original body away.
But once their master's spirit is released into a new body in 1986, the Legendorga are revived in present day to take their revenge on the current Kiva. Unlike the other Demon Races, the Legendorga are all themed after different mythological creatures and can convert other Demon Races into their kind.
They are the antagonists of Kamen Rider Kiva: King of the Castle in the Demon World.
Super Hero Taisen
The Medusa Legendorga was one of the many monsters in the revived Dai-Shocker assembled by Decade to wipe out the Super Sentai, ensuring the survival of the Kamen Riders. After Dai-Shocker's alliance with Dai-Zangyack was revealed, both organizations were wiped out by a gathering of Kamen Riders and Super Sentai. The Medusa Legendorga was destroyed along with several Fangire, Gaiark, and Samurai World Yōma, Rairaiken by the Engine Sentai Go-OngerIcon-crosswiki and Kamen Rider Kiva.