|This article is about a/an form in Kamen Rider Zi-O.|
GhostArmor (ゴーストアーマー GōsutoĀmā) is a Kamen Rider Ghost-based form accessed using the Ghost Ridewatch, invoking Kamen Rider Ghost's Ore Damashii. When summoned, it is projected in a holographic Eyecon and does Ghost's signature pose before dispersing to attach to the user. The GhostArmor's Eyecon Shoulders (眼魂ショルダー Aikon Shorudā) are modeled after Ghost Eyecons, and depending on whether it is used by Zi-O or Geiz, its visor spells out "Ghost" (ゴースト Gōsuto) in katakana or "Ghost" (ごーすと Gōsuto) in hiragana respectively. Once equipped, the user gains some of Ghost's powers including floating, intangibility and the ability to summon Parka Ghosts.
Traveling to early September 2018, Kamen Rider Geiz assumed the GhostArmor as he attacked Sougo Tokiwa, who himself had transformed into Kamen Rider Zi-O. Through his Eyecon Shoulders, Geiz summoned the Parka Ghosts of Ore, Miyamoto Musashi, Isaac Newton and Thomas Edison to assist him.
Facing Another Fourze in 2011, Geiz assumed GhostArmor to defend himself and Zi-O. Summoning the same four Parka Ghosts, Geiz forced Another Fourze into retreat.
On December 8th 2018, Geiz used the Ghost Ridewatch in the Zikan Zax to perform a Zakkuri Cutting to temporarily defeat Another Ghost before he was revived by Time Jacker Heure. Later, Geiz lent the Ghost Ridewatch to Zi-O so he could appropriately fight Another Ghost, with Zi-O swapping his GaimArmor for the GhostArmor while Geiz continued in WizardArmor. and so loaned him the Ghost Ridewatch to assume GhostArmor. Zi-O and Geiz quickly overwhelmed Another Ghost but were stopped just short of performing their respective finishers when Heure revealaed that to defeat the Another Rider would kill him. In this moment of hesitation, the two Riders were assaulted by the Flame Saber of Kamen Rider Decade: Agito Ground Form. With Geiz disarmed, Decade switched to the form of Kamen Rider Hibiki and proceeded to perform his Ongekibou Final Attack Ride to defeat Zi-O.
Going back to 2015, Geiz engaged in battle with Another Ghost. However, he was intercepted by Kamen Rider Decade, who transformed into Kamen Rider Ghost, and they both overwhelmed him. Decade then erased the powers of the Ghost Ridewatch, leaving it as a blank Ridwatch. Luckily, Takeru Tenkuji gave Sougo his Ghost Ridewatch, and, with the Decade Ridewatch, defeated Another Ghost.
Facing Another Kikai, a persistent Another Rider who had no host, Geiz assumed GhostArmor to fight him, being joined by Kamen Rider Woz Futurering Shinobi. Though they unleashed their respective finishers, Geiz and Woz failed to defeat Another Kikai before Sougo arrived, at which point Sworz appeared and forcibly applied the form of Another Kikai to Uhr, who proceeded to make his escape.
- "(Digital beeping) Ghost!"
- ―Activation announcement[src]
- "Rider Time! (upbeat music based on Ghost Driver's standby music) Kaigan! Ghost!"
- ―Transformation announcement in the Ziku-Driver's right-hand slot[src]
- "(Right-hand Ridewatch's announcement)! Armor Time! (upbeat music based on Ghost Driver's standby music) Kaigan! Ghost!"
- ―Rider Armor transformation announcement[src]
This Ridewatch allows the original Ghost to see ghostly entities when he holds it.
- Omega Time Burst (オメガタイムバースト Omega Taimu Bāsuto): Geiz performs a variation of the Omega Drive (Ore) kick where his body and mask glow and his right foot is enveloped in an orange flame produced by the Parka Ghosts before he performs a flying kick covered in spiritual energy.
- Kamen Rider Zi-O