Saigetsu

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 is a high-ranking member of Hundred who transforms into , , and .
==History==
to be added
==Personality==
Saigetsu is a cold-blooded person as he doesn't treat anyone other than himself as human beings; and although he has a cold tone, his bellicose temperament can be seen through out his words.
As Saigetsu was repeatedly defeated by Kamen Rider Legend many times, he gradually lost his calmness and it turned into anger and hatred for Kaguya. This was reflected in the fighting style and tone of voice after his transformation into Ark-Zero and Ark-One, which also grabbed the attention of Gigist, allowing him to use Saigetsu's strong malice to create Ark-One Malgam.
After transforming into Ark-One Malgam, his personality becomes more arrogant and addicted to the power of the Chemies imbued with him, and his tone of voice also becomes much more frivolous.
Commonly, Saigetsu often declares to "scrap" his opponents in battle.
==Forms==
==Equipment==
===Devices===
*Dark Kivat Belt - Transformation device that forms when Kivat-Bat the 2nd bites Saigetsu.
**Kivat-Bat the 2nd
*Fuestles - Whistle-like devices that activate a function, depending on the Fuestle.
*Ark Driver - Transformation device as Ark-Zero and Ark-One.
*Progrise Holder - Carrying straps for Progrisekeys
*Ark-One Progrisekey - Transformation trinket as Ark-One.
===Weapon===
*Attache Calibur - Ark-Zero and Ark-One's weapon
==Relationships==
===Allies=== 
*Gengetsu/Kamen Rider Barlckxs: to be added.
*Mimei/Kamen Rider Glare:to be added.
*Tasogare/Kamen Rider Eternal: to be added.
===Enemies===
*Ho-Oh Kaguya Quartz/Kamen Rider Legend: to be added.
*Butler: to be added
*Houtarou Ichinose/Kamen Rider Gotchard: to be added
*Rinne Kudo/Kamen Rider Majade: to be added
*Supana Kurogane/Kamen Rider Valvarad: to be added
==Behind the scenes==
===Portrayal===
Saigetsu is portrayed by , who previously portrayed Kazuya Misaki in Kamen Rider Amazons, human in , and in .
As Kamen Rider Dark Kiva in Episode 33, his suit actor is , while as Kamen Riders Dark Kiva, Ark-Zero/Ark-One, and the Ark-One Malgam in Episodes 34 and 35, his suit actor is .
=== Etymology===
"Saigetsu" is deviated from the Japanese word for .
==Notes==
*The Kivats usually transform after biting the hand, but it was Takagi's idea to have Kivat-Bat the 2nd bite Saigetsu's neck when transforming, evoking the imagery of a vampire bite.https://www.kamen-rider-official.com/gotchard/34/
*Saigetsu is the first Dark Kiva user to activate King's World End, a world-destroying ability only ever mentioned in supplemental material such as TV Asahi's website, Chozenshu, and Kamen Rider Zukan.
*The leg portions of Dark Kiva's suit are secured with transparent tape.
*Unlike the Ark-Zero and Ark-One from Kamen Rider Zero-One, Saigetsu's versions are categorized as two different Riders by the official website.https://www.kamen-rider-official.com/gotchard/35/ Whereas the fact that the two forms are the same Rider in the source material, a reference is made through Saigetsu transforming directly from Ark-Zero to Ark-One, a feat never performed by either the Ark nor Aruto Hiden.
*The Ark-One Malgam reused Ark-One's undersuit with a new upper body armor.
*Saigetsu's catchphrase is a homage to Narutaki, who always curses their respective riders for foiling their plans.
==Appearances== 
* Kamen Rider Gotchard
**Episode 32: The Great King Appears! The Dolls' Dilemma'
**Episode 33: Legend Rider? 100 Years Too Early!
**Episode 34: Only One! All Roads Lead to Gorgeousness
**Episode 35: Gorgeous Time! Legendary Never Ends
**Episode 36: The Origin of Chemies! I Have Understood 
**Episode 38: Over the Rainbow 
==Navigation==
Category:Gotchard Characters
Category:Gotchard Riders
Category:Reiwa Era Riders
Category:Villains
Category:Dark Riders
Category:Leader
Category:Hundred
Category:Deceased
Category:Revived Riders
Category:Malgam
Category:Hybrid Monsters
Category:Extinct Monsters
Category:Zombie Monsters
Category:Shark Monsters
Category:Ammonite Monsters
Category:Astronomical Object Monsters
Category:Debatable Riders