OOOArmor (ＯＯＯアーマー,Ōzu Āmā) is a Kamen Rider OOO-based form accessed using the OOO Ridewatch, invoking Kamen Rider OOO's Tatoba Combo. When summoned, it takes the form of a robotic hawk, tiger, and grasshopper before transforming into armor and attaching to the user. Depending on whether it is used by Zi-O or Geiz, its visor spells out "OOO" (オーズ,Ōzu) in katakana or "OOO" (おーず,Ōzu) in hiragana respectively. Its chest reads "Taka" (タカ,"Taka"), "Tora" (トラ,"Tora"), and "Batta" (バッタ,"Batta").
"With the medal combo of Hawk, Tiger, and Grasshopper, the animal-powered Rider is... (Clock ticking noise) OOO! (メダルのコンボでタカ・トラ・バッタ動物パワーのライダーは…オーズだ！,Medaru no konbo de taka・tora・batta dōbutsu pawā no Raidā wa… Ōzu da!)"
ScanningTime Break (スキャニングタイムブレイク,Sukyaningu Taimu Bureiku): Zi-O leaps to the air as three giant medal-like projections (In which the medals have "Taka" (タカ), "Tora" (トラ), and "Batta" (バッタ) written on them) appear in front of him. Zi-O then drops down for a kicking attack with the three medals converging into one. The image on the converged medal is similar to OOOArmor's chest-plate.
Scanning Time Break (Step 1: Medal projection)
Scanning Time Break (Step 2: Chest-plate projection)