After sealing the Bat Undead, meets a web-journalist named Kotarō Shirai, who begins investigating the Riders after witnessing Kenzaki carelessly changed back from Rider form. To lessen the risk of exposure, and to find a place to board after losing his apartment for not paying his rent in time, Kenzaki made a deal with Kotarō: In exchange for information concerning the Riders, Kotarō would provide a place for Kenzaki to stay; being that his salary with BOARD was barely enough to make a living. But later that evening, disaster struck as BOARD HQ fell under attack from the Locust Undead. With Tachibana walking off without offering aid and Karasuma no where to be found, Kenzaki and Shiori set-up a new base of operations in Kotarō's home, using whatever equipment left undamaged during the Undead Raid on BOARD HQ. Though operating at a limit capacity, Kenzaki, Hirose, and Kotarō successful began track and sealing any active Undead in the area. But eventually Kenzaki began tracking down his renegade partner Tachibana, eventually leading to an encounter with Chalice, whose attempts to befriend him ended sourly.
Kenzaki was later kidnaped by Isaka's men to be used in a experiment to test the human/Category Ace fusion ratio by pitting him against the Trilobite Undead, his fusion rate increasing upon seeing Hajime with his captors before Chalice gets involved as well before Garren provides backup. After that Kenzaki learns that Hajime is a Undead, confronting him before they fight until the Zebra Undead start his attack. Though he knew that Chalice was a Undead operating under the alias, Hajime Aikawa, Kenzaki eventually believed that there's some good in Hajime and that he's not the monster he originally though him to be.
However, once Griffa Undead was sealed, Hajime begins to lose control and his impulse as Joker comes forth with the Stone of Sealing creating his army of DarkRoaches to eliminate all humans. In the end, Kamen Rider Blade is the only one to combat him head on, both equal in power, intend on saving Hajime from himself.
In the series ending, Kenzaki sacrificed his humanity in order to save Hajime, thus becoming the Navy Joker. Hajime is allowed to keep his Human Spirit card to maintain his disguise and stays with the Kurihara family for the rest of his life; but still remembers what Kenzaki has done for him for if he and Kenzaki cross paths, fate will step in and force them to fight.
In the movie Missing Ace, however, he was forced to seal Hajime as the Joker Undead, effectively ending the Battle Royale. Four years after, he became a garbage man who witnessed the combat of the New BOARD Riders when the Albino Joker released half of the Undead, eventually joining them back as Blade after Leangle resealed his Category Ace. He asked Leangle to unseal the Joker Undead so as to save Amane from the AlbiRoaches. When she was sealed by the Albino Joker to access Jashin 14, he intended to exchange his life for her, but was pushed over by Hajime to be sacrificed instead. Once more he was forced to seal Hajime to weaken Jashin 14, then killed it and the Albino Joker in it with King Form.
The Ace Form is the default transformation of Rider System-02. The transformation harnesses the Beetle Undead DNA from the ♠A: "Change Beetle" Rouse Card, utilizing the Blay Buckle Rider System to fuses the Beetle Undead's DNA with Kazuma Kenzaki transforming him into Kamen Rider Blade. This Rider form has no distinguishing capabilities or attributes apart from the other Riders except its melee-oriented design; its ability to modify its capabilities with Rouse Cards is the only note worth mentioning.
The Jack Form is a combat extension of the Rider System which harnesses the power of Category Jack Rouse Cards (in the case of Blade, the ♠Jack: "Fusion Eagle") via the Rouse Absorber. Initiating Blade's Jack Form transmogrifies the Rider Armor with the attributes and characteristics of the Eagle Undead DNA with the ♠J: "Fusion Eagle" card, as well as enhancing Blade's combat perimeters. Blade's Jack Form imparts a number of enhancements; the first being the enhancement of the Blayrouzer through a blade extension. Outside of this cosmetic appendage, the Blayrouzer essentially functions the same. The second advancement is the addition of reinforced golden-armor plating which increase resilience to impact damage. But the most drastic modification is the inclusion of wings, which enables flight for the Rider.
The King Form is the ultimate combat extension of the Rider System, which only Blade can obtain. Using the Rouse Absorber, this transformation is initiated using the ♠K's "EVOLUTION KING" effect in conjunction with the ♠Q's "ABSORB QUEEN" effect. The King Form addresses many issues with Blade's combat capabilities such as defense. However, with all these improvements, Blade's King Form suffers from one glaring flaw: Kazuma Kenzaki. Initial specs intended only for the Blade Rider System to extend its combat capacities with the ♠K: "Evolution Caucasus", but due to Kenzaki's unusually high fusion coefficiency the system exceeded its perimeters and exposed a disastrous glitch in the overall Rider System. In the case of individuals like Kenzaki, activating the King Form extension initiates the fusion of, not just one, but the DNA of ALL 13 sealed Undead associated with a particular card-suit. With extended activity in this form, the subject's fusion coefficiency would raise exponentially, ultimately mutating the human being into a Joker-type Undead. To that end, use on Kenzaki's part, was strictly cautioned and advised only as a last resort.
|Category||Card Avatar||Undead Avatar||Point Value||Card Effect|
|♠A||Change Beetle||Beetle Undead||--||"CHANGE": Initiates the Kamen Rider transformation when inserted into the Blay Buckle. Effects amplified after activating King Form; becomes a Gold Rouse Card.|
|♠2||Slash Lizard||Lizard Undead||400FP||"SLASH": Enhances the efficiency of edged-weapons. Effects amplified and FP increases by 200 points after activating King Form; becomes a Gold Rouse Card.|
|♠3||Beat Lion||Lion Undead||600FP||"BEAT": Enhances the striking power of hand-blows. Effects amplified and FP increases by 200 points after activating King Form; becomes a Gold Rouse Card.|
|♠4||Tackle Boar||Boar Undead||800FP||"TACKLE": Enhances the momentum behind tackle-attacks. Effects amplified and FP increases by 200 points after activating King Form; becomes a Gold Rouse Card.|
|♠5||Kick Locust||Locust Undead||1000FP||"KICK": Enhances leg strength and power behind kicks. Effects amplified and FP increases by 200 points after activating King Form; becomes a Gold Rouse Card.|
|♠6||Thunder Deer||Deer Undead||1200MP||"THUNDER": Supplements the next attack with a lightning-attribute. Effects amplified and MP increases by 200 points after activating King Form; becomes a Gold Rouse Card.|
|♠7||Metal Trilobite||Trilobite Undead||1600MP||"METAL": Enhances resilience to physical harm by transmutation into organic metal. Effects amplified and MP increases by 400 points after activating King Form; becomes a Gold Rouse Card.|
|♠8||Magnet Buffalo||Buffalo Undead||1400MP||"MAGNET": Enables supernatural manipulation of magnetic polarities over matter to a limited extent. Effects amplified and MP increases by 400 points after activating King Form; becomes a Gold Rouse Card.|
|♠9||Mach Jaguar||Jaguar Undead||1600MP||"MACH": Enhances speed and agility. Effects amplified and MP increases by 400 points after activating King Form; becomes a Gold Rouse Card.|
|♠10||Time Scarab||Scarab Undead||1800MP||"TIME": Enables supernatural manipulation of time over a limited radius. Effects amplified and MP increases by 400 points after activating King Form; becomes a Gold Rouse Card.|
|♠J||Fusion Eagle||Eagle Undead||+2400EP||"FUSION JACK": Replenishes Rouzer AP +2400; This card initiates the Jack Form transformation when roused in conjunction with ♠Q: "Absorb Capricorn" that has been set into the Rouse Absorber. Also effects are amplified after activating King Form; becomes a Gold Rouse Card.|
|♠Q||Absorb Capricorn||Capricorn Undead||+2000EP||"ABSORB QUEEN": Replenishes Rouzer AP +2000; Set into the Rouse Absorber, this card can initiate the additional transformations when roused in conjunction with either ♠J: "Fusion Eagle" or ♠K: "Evolution Caucasus" Rouse Cards. Also effects are amplified after activating King Form; becomes a Gold Rouse Card.|
|♠K||Evolution Caucasus||Caucasus Undead||+4600EP||"EVOLUTION KING": Replenishes Rouzer AP +4600; This card initiates the King Form transformation when used in conjunction with ♠Q: "Absorb Capricorn" that has been set into the Rouse Absorber. This card also increases the effects of other Rouse Cards within its suit when used in conjunction with it. Also effects are amplified after activating King Form; becomes a Gold Rouse Card.|
Blade's signature card combo; The combo enables Blade's signature flying side kick attack, coupling ♠5's "KICK" effect imbued with the lightning-attribute of the ♠6's "THUNDER" effect. The Jack Form version, uses the added advantage of J-Blade's flight capabilities to enhance the attack.(Jack) Lightning Slash
This card combo activates Blade's signature sword-strike, coupling the ♠2's "SLASH" effect with the lightning-attribute of the ♠6's "THUNDER" effect. The Jack Form version, uses the added advantage of J-Blade's flight capabilities to enhance the attack.Lightning Sonic
This card combo enhances the "Lightning Blast" combo with the addition of ♠9's "MACH" effect. This activates an stronger version of Blade's "Lightning Blast" attack, which compounds the force and lethality of the attack with the addition of the super-speed MACH effect.Royal Straight Flush
K-Blade's strongest combo; Once activated, the effects of this Rouse Combo imbues K-Blade with evolved effects of ♠10, ♠J, ♠Q, ♠K, and ♠A to produce the ultimate sword-strike.Straight Flush
This Rouse Combo summons the Blayrouzer in addition to K-Blade's King Rouzer in a special dual-sword strike.Four Card
This Rouse Combo borrows the Category 6 Rouse Cards from all 4 suits and amplifies their effects with the ♠K: "Evolution Caucasus". Its combo effect imbues K-Blade with the evolved elemental powers of the Category 6 cards for a finishing sword-strike.Straight
Also known as Straight Tempest Crash, K-Blade's Rider Kick.