|This article is about a/an trio of allies in Kamen Rider Kiva.|
The Arms Monsters (アームズモンスター Āmuzu Monsutā) are last of three Races of the 13 Demon Races (魔族 Mazoku) wiped out by Fangires, whom they hate to be compared to and initially vowed revenge on for the genocide of their races. Though they intervined with Otoya Kurenai and other humans on a regular basis, the three eventually befriended him and seemingly stopped killing other humans. When the King offers them a chance to be spared, they were told that they had to execute Otoya for him. Refusing to execute their friend, they were sealed away into small statues until Otoya saves them. However, upon making a Darkness Pledge (闇の盟約 Yami no Meiyaku) to Otoya prior to his death, they are marked with orbs on their bodies and their original abilities sealed as they are then placed inside Castle Doran as its caretakers, watching over Wataru and the events of the outside world via tarot cards or playing chess or Hell's Old Maid to pass the time, the later game having a penalty on the loser.
As a result of the pact, the Arm Monsters become Kiva's supporters, protecting the Wonderful Blue Sky Organization by allowing Kiva to access other powerful forms, possessing their fighting skills and mentality. They can sometimes get directly involved when needed to support Kiva.
During the events of Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship, the Arms Monsters were briefly possessed by Urataros, Ryutaros and Kintaros in the 1930s whom they are very similar to.
- Main article: Arms Monsters (A.R. World)
The Arms Monsters are also the servants of Kiva in the A.R. World of Kiva, each the last of his kind. Composed of Garulu of the Wolfen Race, Basshaa of the Merman Race, and Dogga of the Franken Race, they support Kiva by turning into the weapons that allow Kiva to change form. They are absorbed into Beetle Fangire's breast plate and shoulder armor when they question their new king's intentions of removing the human/Fangire coexistence law.
- The Arms Monsters turning into weapons is very similar to Magichange from the Disgaea franchise
The power the Arms Monsters lend Kiva are harnessed in the Kiva Garulu (キバガルル Kiba Garuru), Kiva Basshaa (キババッシャー Kiba Basshā), and Kiva Dogga (キバドッガ Kiba Dogga) Form Ride Cards (フォームライドカード Fōmu Raido Kādo), which are used by Decade to transform into Kiva's respective Arms Monster forms. They are used in quick succession in the World of Ryuki to fight Kamen Rider Knight. The Kiva Garulu card is used again in the World of Agito to fight Kamen Rider Exceed Gills.
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