Joker Undead

The , or simply , are two special Undeads that exist outside the standard four suits (clubs, diamonds, hearts, and spades). Their existence subjects any world it occupies into the rules of Battle Fight, a free-for-all battle royale between multiple species of Undead. 
In the event that no other competitors remain in the Battle Fight, the Joker Undead will be required to carry out their given duties by the Monolith, regardless of personal intentions. Provided that they still remain the victor after their task is finished, the Joker Undead will then recieve the power to shape the world as they pleaseKamen Rider Blade: Missing AceThe Eternal Trump.
Evidently, the Black Joker's world destruction ability is not limited to their own world, being capable of destroying other worlds such as the Game World. 
==History==
Hajime Aikawa is the , being the 53rd participant of the Battle Fight. Once unsealed in modern times, he was manipulated by the Human Undead into assuming a human identity, gaining a sense of empathy in the process. Having become a member of human society, Hajime uses the powers of the Mantis Undead to masquerade as Kamen Rider Chalice. 
In the finale of the series, Hajime became the "last Undead standing", which awakened his instincts as the Black Joker. To save Hajime and the world itself, Kazuma Kenzaki intentionally overuses King Form and mutates into a second Black Joker. Responding to this, the Monolith stops the world's destruction, before ordering Hajime and Kazuma to fight each other. Kazuma adamantly refuses to this, outright disobeying the Monolith's commands. Knowing that his presence could potentially cause Hajime to lose control once more, Kazuma then willingly disappears from his friends, though not before vowing to one day overcome his fate as an Undead. 
In a possible timeline by Kamen Rider Zi-O, fourteen years later since Kazuma's mutation as an Undead, Amane Kurihara is forced to transform into Another Blade by White Woz. To save Amane, Hajime transforms into Kamen Rider Chalice once again, somehow resulting in Kazuma losing control over his Undead instincts. Ultimately, the two have their Undead powers absorbed by Another Blade, disqualifying them from the Battle Fight. After Sougo Tokiwa/Kamen Rider Zi-O solved the situation, the Battle Fight had effectively been ended, with the Monolith itself being destroyed. No apparent traces of the Black Joker remain in either the Ridewatches or Amane, heavily implying that its existence itself had been terminated. 
===Missing Ace===
Kamen Rider Blade: Missing Ace explores a different continuity than the events of the series' finale. In this timeline, Kazuma chose to seal Hajime away, but it inadvertently unsealed the . Being designed to be a back-up Undead that could start the Battle Fight once more, the Albino Joker unsealed several Undeads that were sealed away, killing Kei Karasuma in the process. 
As the 54th participant in the third Battle Fight, it assumed the identity of Junichi Shimura and infiltrated BOARD as Kamen Rider Glaive, later murdering Shin Magaki and Natsumi Miwa for their Category King cards to summon Jashin 14. 
In the fight against the Albino Joker, Kazuma orders Leangle to release Hajime from his card, reuniting the four Kamen Riders. When Amane is used as a sacrifice for Jashin 14, Hajime offers himself up instead, allowing Blade King Form to destroy Jashin 14 and the Albino Joker for good. 
===Decade===
In the World of Blade as depicted in Kamen Rider Decade, the Battle Fight does not appear to exist, with the existence of the Joker Undead being unclear. Kamata had worked with the CEO of BOARD Corporation Hajime Shijyo to create an artificial Undead using a combination of DNA taken from the Category-Ace Undeads used by the Rider System (Beetle, Stag, and Spider), and the life-forces of both Sakuya Hishigata and Mutsuki Kuroha. By scanning the completed Joker Rouse Card into the Chalice Rouzer, Hajime can transform into the Joker Undead. He is later destroyed by Kazuma and Tsukasa.
===Super Hero Taisen===
In Kamen Rider × Super Sentai: Super Hero Taisen, Joker is one of the monsters ressurected by Doctor G and becomes one of Dai-Shocker's Great Commanders. He takes on the successfully alongside other commanders. In the final battle, Joker is seen for the last time facing .
==Gallery==
KRBl-Joker Undead (Kazuma Kenzaki ver.).png|thumb|Joker (Kazuma Kenzaki ver.)
KR-AlbinoJoker.png|Albino Joker
jokernded.jpg|Joker concept art
==Appearances==
==Notes==
*Notably, Kenzaki never transforms into his Joker Undead form on-screen, assuming that he has one. The only hints shown in the original series to this is his Chalice Rouzer and green blood. 
**Concerning the details of his Undead physical characteristics, various Kamen Rider Blade-related media has presented different interpretations of his Joker form. According to description from the S.I.C. Hero Saga story, "Day After Tomorrow", Kenzaki's Joker form is physically identical to Hajime's and is named . This story depicts him wielding a double-edged sword similar to the one used by the Caucasus Undead. The Kamen Rider Blade novel, however, describes his Joker form resembling the Beetle and Caucasus Undeads. To this date, the Toei Company has yet to release any official statement or rendition regarding the description of Kazuma's Joker form.
Category:Villains
Category:Kamen Rider Blade
Category:Kamen Rider like
Category:Undeads
Category:Leader
Joker (Blade)
Category:Monsters with more than one identity
Category:Monsters who appeared in Decade
Category:Dai-Shocker Generals