Kazuma Kenzaki/Zi-O

In 2004, Kazuma Kenzaki (剣崎 一真) was Kamen Rider Blade (仮面ライダーブレイド).

Meeting Sougo Tokiwa
"Can fate not be denied?!"

- Kenzaki screamed on Hajime, struggling to hold his undead's instinct

During Hajime's battle against Sougo, Kazuma Kenzaki had reappeared in front of them. Angrily asking Hajime why he had used his Undead powers, Kenzaki transformed into Kamen Rider Blade. In a seemingly uncontrollable fit of rage, Kenzaki viciously attacked Chalice, despite his pleas to stop. The battle was evenly matched, with both sides showing no signs of giving up.

While Kenzaki and Hajime were busy fighting each other, Zi-O and Another Blade resumed their battle. Just when Kenzaki used his Lightning Sonic, Another Blade was knocked towards Hajime's side. Noticing this, Hajime attempted to shield her with his body. Kenzaki's attack proved too powerful to completely block though, causing Another Blade to revert back into Amane. Hajime called out to her in concern, causing Kenzaki to freeze in shock. Once he was sure Amane was uninjured, Hajime then escaped from Kenzaki, with Amane chasing after him.

The battle having ended, Kenzaki went to the 9 5 DO with Sougo and his friends. There, Kenzaki explained the situation, before telling them that the matter did not concern anyone else. In a huff, Kenzaki then rushed out the shop to find Hajime.

Finding Hajime with Amane, Kenzaki forced the former to battle him again. In the middle of their battle though, Amane cried out for them to stop fighting each other. White Woz then reappeared before Amane, forcefully turning her into Another Blade. Another Blade then went berserk, attacking both Blade and Chalice. The two tried to turn Amane back to normal, but were unsuccessful.

Once knocking back Kenzaki and Hajime into their human forms, Another Blade absorbed the essence of the Joker Undead from them into herself, thus technically becoming the victor of the Battle Fight. Now wounded and bleeding red blood, Kenzaki and Hajime were forced to watch as Another Blade summoned the monolith, which started producing an army of dark colored Joker Undeads while the skies darkened. Luckily, Geiz, Black Woz, and Sougo intervened in time, awakening the new power of Zi-O Trinity which defeated the powered up Another Blade. They reverted Another Blade back into Amane and destroyed the Another Blade Ridewatch, while the Blade and Chalice Ridewatches also fell from her. The monolith seemingly was reduced to dust as Another Blade was destroyed. The battle having ended, Kenzaki watched from afar as Hajime and Amane reconciled with each other. Sougo then came up to him, trying to hand him the Blade Ridewatch and the Chalice Ridewatch. Kenzaki allows Sougo to keep the watches, feeling that he would need it more than them, and noting that thanks to them, the power of the Jokers had been sealed. Telling Sougo that he and Hajime can now continue to live on with their lives, Kenzaki goes up towards his old friends, while Sougo and Geiz watch with a smile.

Personality
When reappearing in Kamen Rider Zi-O though, Kenzaki had changed greatly for the worse. Due to Hajime Aikawa/Kamen Rider Chalice's actions, Kenzaki was influenced by his Undead instincts, becoming angry and cynical. This is to the point of showing little care towards the possibility of humanity's extinction, something unthinkable in the original series. Instead, Kenzaki seemed focused solely on defeating Hajime, despite the latter's pleas to stop. However, this was largely due to the effects of White Woz's tablet. Despite this aggressiveness, Kenzaki was shown to be regretful at having to fight against Hajime, as well as being concerned with Amane's predicament.

Once his mutation as the Joker Undead was reversed, Kenzaki no longer became bound by the Battle Fight's effects, effectively losing his former aggression. In a somewhat calm but satisfied manner, Kenzaki even stated his gladness at being released from his Undead instincts.

Forms
Blade "Turn Up!"

- Transformation announcement

Rider Statistics Rider Senses: Ability Parameters: Special Attacks:
 * Rider Height: 201 cm.
 * Rider Weight: 101 kg.
 * Hearing: 5 km.
 * Punching Power: 280 AP (2.8 t.)
 * Kicking Power: 480 AP (4.8 t.)
 * Resistance: 120 t.
 * Maximum Jump Height: 33 m.
 * Maximum Running Speed: 100 m. per 5.7 sec.
 * Boar Tackle: 800 FP (8 t.)
 * Lizard Slash: 400 FP (4 t.)
 * Locust Kick: 1000 FP (10 t.)
 * Deer Thunder: 1200 MP (12 t.)
 * Lion Beat: 600 FP (6 t.)
 * Dragonfly Float: 1000 FP (10 t.)
 * Jaguar Mach: 1600 MP (16 t.)
 * Deadly Blow: 2000 MP (20 t.)
 * Lightning Blast: 2200 AP (22 t.)
 * Lightning Sonic: 3800 AP (38 t.)
 * Lightning Slash: 1600 AP (16 t.)

Kamen Rider Blade can be assumed by using the Blay Buckle and Change Beetle Rouze Card. The transformation fuses the user with the DNA of the Beetle Undead. This form has no capabilities or attributes that distinguish it from the other Riders in Ace Form other than its melee-oriented fighting style and the abilities it acquires from the Spades Suit Rouze Cards. Despite this form's combat perimeters being lower than Chalice and Leangle, Kenzaki's compatibility, ingenuity, and skill as a Kamen Rider help him compensate. This helped him overcome formidable foes including the Caucasus Undead, a Category King Undead, without having access to his other Rouze Cards. In Missing Ace, Kenzaki even managed to defeat the Joker Undead in Ace form alone, further proving his skill.

Appearances: Zi-O Episode 29-30

Equipment

 * Blay Buckle: Blade's transformation belt
 * Rouze Card: Allow Blade to perform special attacks
 * Blay Rouzer: Blade's personal weapon

Portrayal
Kazuma Kenzaki is portrayed by Takayuki Tsubaki (椿 隆之). As Kamen Rider Blade, his suit actor is Hajime Kanzaki (神前 元).

Appearances

 * Icon-zi-o.png Kamen Rider Zi-O
 * Episode 29: Blade Joker!? 2019
 * Episode 30: 2019: Trinity Has Begun!
 * Episode 37: 2006: Next Level Kabuto