|Kivat-bat the 3rd
Kivat-bat the 3rd is the 3rd generation of the Kivat-bat Family, distinguished among the Kivat Race, possessing two heirlooms, the green Demon Imperial Stone on the forehead and the Kivat Persona on the face. Called "Kivat" for short, he is a solid character with dry wit, tending to have a bitter attitude. He has a technique called Kivat Cutter with the Kivat Wings which are ornamented with Lucifer Gold. He formed a partnership with Wataru to give him the power of Kiva, infusing the Active Force which is one of the Demon Imperial Powers from the Active Fangs before attaching to the Kivat Belt to allow his human partner to transform by the Active Force, as well as blow the Fuestles to evoke their power. He likes Megumi because she reminds him of Amedeo Modigliani's masterpieces, particularly the man's works of long-necked women. Kivat also serves as a narrator of sorts, telling the viewer historical facts while scenes from the previous episode play in the background during the early episodes. In the later episodes, with Tatsulot, Kivat tells the viewer of current events during the 2008 storyline.
|Kivat-bat the 2nd
Kivat-bat the 2nd is the second generation of the Kivat-bat Family, and Kivat's father. As the King's partner, he infuses him with the power of Kiva. However, unlike his son, Kivat-bat the 2nd controls a lot more Demonic Power that enables Dark Kiva to fight at his utmost limit. Eventually, disgusted with his partner's methods, Kivat-bat the 2nd offers Otoya his power to become Dark Kiva. Kivat-bat the 2nd later appears in present day to forge a pact with Taiga, making him the new Dark Kiva.
|Kivat-bat the 4th
The son of Kivat-bat the 3rd from the year 2030, he is orange and assists Masao Kurenai to become the New Kiva.
An intelligent computer created by the 3WA, he can transform Takato into Kamen Rider Rey.
|Arc Kivat/Mecha Kivat
With the assistance of the mechanical monster Arc Kivat, Takashi can transform into Arc, the King of the Castle in the Demon World. In the process, Arc Kivat assumes Mecha Kivat mode as his persona cast comes off and yells, "Go to Hell."
Kivara is a female Kivat, she is Kivat-bat the 3rd's younger sister. She learns of Decade from Narutaki, and uses her power to bring Yusuke into her world, and then sends Tsukasa into another to do battle with Kaixa. She later ends up traveling with the Hikari Studio. Her overall goals further into question. In Kamen Rider / Kamen Rider Double & Decade: Movie War 2010, Kivara helps Natsumi to become Kamen Rider Kivara.