Black Woz

"Rejoice! The one to inherit all Rider powers, the King of time who will rule over the past and the future. And his name is Kamen Rider Zi-O!"

- Woz's announcement of Zi-O.

The Mysterious Prophet Woz (謎の予言者ウォズ) is a zealous supporter of Oma Zi-O from 2068 who travels back in time to 2018 and assists Sougo Tokiwa in order to help him become Oma Zi-O.

He will later transform into Kamen Rider Woz (仮面ライダーウォズ).

The birth of Zi-O
Woz appeared before Sougo in anticipation of his first transformation into Zi-O, congratulating him and warning him vaguely of Geiz's Time Mazine before disappearing. When Sougo encountered Another Build, Woz appeared again to encourage Sougo to transform into Zi-O, providing him with the Ziku-Driver.

Obtaining Build's Power
Woz once again appears after Sougo's narrow escape from Geiz, which greatly startled the future monarch. Woz reveals that Sougo eventually rises to become King through military conquest using the power of Zi-O. He proclaims that he is Sougo's ally and that all his efforts will be toward keeping Sougo on the path to become the demon king. He warns Sougo of the Time Jackers and their aim to raise a new king to usurp Zi-O. However, Woz immediately disappears after giving this warning.

Woz appears again in Sougo's home to inform him of the circumstances of Another Build. He reveals that due to the Time Jackers' alteration of history, the kaijin is now considered the true Kamen Rider Build. He also informs Sougo that even though he is destined to be king, he is unable to defeat Another Build even while Geiz combats him.

Woz appears during Sougo's contemplation of using the Build Ridewatch, with Sougo confused at his presence in the year 2017. He tells Sougo that by using the Ridewatch, he accepts inheriting the power of Kamen Rider Build. He asks if he is willing to accept the responsibility of that power to which Sougo replies with an enthusiastic affirmative. After Sougo dons the Build Armor, Woz joyfully announces his king's inheritance of his first Rider power.

Obtaining Fourze's Power
Woz appearing before Sougo as the latter was chasing Yamabuki Karin. Sougo the proceed to ask Woz if the Another Riders are behind the incident, which Woz affirms, but he later admits that he didn't really know the details. However, Woz tells Sougo that the incident starts with 'Shooting Star' before disappearing once more.

Obtaining Faiz's Power
Woz was mentioned by Sougo as Kusaka explained his motives and the origin of Ryuichi Sakuma and Yamabuki Karin. Sougo realizes that 'Shooting Star' is actually Ryusei Academy, which Tsukuyomi affirms

Obtaining Wizard's Power
Woz saves Geiz from falling down to his death by Schwarz's powers. But Geiz refused being saved by him, despite how they've known each other as "old friends".

Personality
Woz proudly supports Sougo as the identity of Oma Zi-O, assisting him as much as he can. His motivations for doing so are unknown. He will also go in lengths to protect Sougo, as demonstrated when he appeared and attacked Another Fourze.

While Geiz and Tsukuyomi are very wary of his presence, it also shows that Woz is trying to manipulate Sougo into becoming Oma Zi-O. He even shows signs of skepticism of the boy's intention of changing his destiny.

Powers and Abilities

 * Time Travel: Woz possesses the ability to travel back and forth across the timeline. This often comes to the confusion of Sougo Tokiwa, as Woz tends to appear suddenly and without the apparent use of a Time Mazine.
 * Superhuman Strength: Woz effortlessly blocked a punch from Another Fourze with his bare hand.
 * Energy Attack: Woz has been shown to be able release an energy attack from his hand, which he uses to knock Another Fourze away.
 * Flight: Woz possesses the ability to fly.

Forms
Woz uses a variant of Ridewatches called Miridewatches in the BeyonDriver to transform into Kamen Rider Woz and access forms based on Kamen Riders of the future.

Devices

 * BeyonDriver - Transformation device
 * Miridewatches - Transformation trinkets

Weapons

 * Zikan Despear

Relationships

 * Sougo Tokiwa/Kamen Rider Zi-O: Woz is the zealous believer of Oma Zi-O. As he believed Sougo to be the evil Oma Zi-O, Woz helps Sougo in his journey to becoming a devil king, even giving the Ziku Driver to show his support. He was surprised to hear that Sougo wanted to be a benevolent ruler but still chose to follow him anyway. He refers Sougo as My Overlord (我が魔王). While in return, Sougo is baffled due to Woz always appearing from nowhere, even when he was on different Timeline without apparent use of Time Mazine.
 * Geiz Myoukouin/Kamen Rider Geiz: Woz and Geiz known each other as "old friends". As Schwarz used his power to cause Geiz to fall, Woz saved him.

Portrayal
Woz is portrayed by Keisuke Watanabe (渡邊圭祐).