Isaka

is the human form of the Category Jack of Diamonds Suit  and the first Category Jack Undead that appeared in the show. He's also the creator of the Leangle Buckle and killed Sakuya's fiance.
==History==
===Background===
Just like all other Undeads, the Peacock Undead was created by God 10,000 years ago to participate in the event called Battle Fight. The Peacock Undead was defeated during the battle and imprisoned in the form of a Rouse Card.
In 2002, a group of archeologists accidentally freed all the Undeads, including Peacock Undead, who took on a human guise known as Isaka and controlled the minds of several humans to create an organization capable of creating the strongest Kamen Rider.
===Kamen Rider Blade===
Isaka first appeared in his limousine watching Hajime from a distance. At night, he saw Tachibana with Sayoko from outside the latter's window, later interacting with the Rider and engaged into combat without transforming. He later ordered his men to kidnap Kenzaki to use for his experiment, even knocking him out when he attempted to realiate against his scientists. He then offered to show Hajime his experiment, but when the Rider refused, Isaka showed him a video of his men placing a timed bomb at the Jacaranda Cafe to make him change his mind. Eventually, when Kenzaki transformed into Blade out of rage for supposedly seeing Hajime on his side, Isaka later noticed Blade's power level increasing over 1,000 due to his anger. Once Hajime joins in the fray against Kenzaki, Isaka told one of the scientists to calculate Hajime's power level as well. Tachibana later showed up to enter the fray, conveniencing Isaka the trouble of finding and capturing him. However, after Karasuma turned off the electricity, Isaka ordered his men to turn on the generator and capture the chief. Stating that he was done with the lab, Isaka has all the bombs he had blow up, including the one left in a paper bag, while he and his followers leave the area. 
Isaka later observed Garren's fight with the Zebra Undead, later commending to the latter of its strength. The Zebra Undead then attcked him and knocked his shades off, making Isaka placed him in agony under his control to be used against Tachibana. Isaka later attempted to sway Tachibana into working for him, promising to make the Rider stronger. Tachibana refused and as such the two battled before Isaka defeated him. He later had Tachibana soaked in a large glass water tank filled with Schuld Kestner seaweed to get him under his control while also giving him the means to telepathically communicate with him. When Kenzaki decided the impuslsively fight him, Isaka stated that he had no choice but to do so, then told Tachibana to come to his aid against Kenzaki. 
Upon noticing of the Spider Undead's presence, Isaka ordered Tachibana to go after it, citing him to be a much bigger target than Kenzaki. After noticing Sayoko trying to cure Tachibana from his predicament, Isaka went flying outside her window again and attacked her, threatening her not to interfere with his schemes. When Hajime fights Tachibana to prevent them from claiming the Spider Undead, the latter told Isaka of this and as such, Isaka joined in the battle to help Garren defeat Chalice. Afterwards, Isaka commanded Tachibana to continue after the Spider Undead, while claiming that the power would soon be his. 
Upon seeing Sayako trying to help Tachibana again, Isaka then killed her for meddling in his affairs. He later asked Tachibana to hand over the Change Spider card, but the Rider refused upon noticing Isaka's ambitions. Isaka then decided to fight him the get the card back, explaining to Garren that the time limit of the seaweed was up. Isaka then defeated Garren, took the Rouse Card from him, and told him to come to him if he wanted more power. 
At the lab, Tachibana goes up to Isaka to confirm if he was the one who killed Sayoko. Isaka confirmed, thus leading to Tachibana to shoot at the water tank, claiming he was a fool for letting him do that to him. They then engaged in another fight near blossom trees, with Tachibana reigning victorious this time, prompting Isaka to use his fireballs to retreat. Tachibana then shouted Isaka's name in anger. After checking on his chest wound, Isaka then went to check up upon the teenage boys he had kidnapped. After Karasuma suggested that Mutsuki was the perfect candidate to be Leangle, Isaka had his men test out the belt's power, being amused at the immense power when the attempted transformation made Mutsuki fall down. While having his men kidnap more teenage boys, Isaka was later confronted by Kenzaki and started fighting him until Tachibana arrived to settle things with him. As Tachibana reigned victorious again, he screamed Sayoko's name right before using the Burning Divide to finish Isaka off. Afterwards, Isaka briefly reverts back to human form in disbelief of being defeat before falling down on the sand and switching back to his Undead form. Tachibana then used a Blank Card to finally seal Isaka, knowing that he avenged Sayoko. 
With Isaka sealed, all the men that worked for him were free from his brainwashing as well as all his captives set free as well. However, Isaka's actions would cause the Spider Undead to corrupt Mutsuki, with the heroes trying to help him break free over the next several episodes. 
In a Missing Ace preview, he chases Natsumi Miwa and Shin Magaki before an offscreen defeat at the hands of Glaive. 
==Video Game appearances==
===Kamen Rider Blade (video game)===
The Peacock Undead is one of many Undead who appear in the Kamen Rider Blade video game.
==Personality==
Isaka is presented as a mad scientist who uses others for his experiments and tools, with his ultimate scheme to make Leangle as his Ultimate Rider. He has emotionless, having only empathy for himself, with no qualms of bombing whatever he deems useless or the fact that the people he uses his experiments on were teenage boys. Isaka's modus operandi also includes brainwashing and manipulation, as shown on his own men and Tachibana. He is so very determined and arrogant with his schemes that when Sayoko tried to interfere with his schemes, Isaka decided to off her when she ignored his warning, which ultimately proved to be his undoing.
==Powers and Abilities==
===Powers===
*Royal Club Undead Physiology: Isaka can utilize the powers of his original form even in his human guise, he was usually seen flying and throwing fireballs before transforming into his true form.
===Abilities===
*Genius-Level Intellect: Isaka is a highly intelligent individual and was responsible for organizing a massive kidnapping scheme for the creation of Kamen Rider Leangle.
*Skilled Swordsman: Isaka is a very skilled swordsman.
*Multilingualism: Isaka is able to fluently speak the Undead Language and Japanese.
==Forms==
==Relationships==
===Allies===
*Trilobite Undead: The Trilobite Undead was held prisoner by Isaka and turned into a slave through mind control, he used the Trilobite Undead to test Kamen Rider Blade's strength in order to develop the Leangle System.
*Zebra Undead: Originally the Zebra Undead was acting alone, but was soon turned into a slave by Isaka so he could test Kamen Rider Garren's awakened power.
*Lion Undead: The Lion Undead was manipulated by Isaka to kidnap people compatible with the Leangle system.
===Enemies===
*Sakuya Tachibana:Isaka took advantage of Tachibana's psychological fragility to turn him into a violent puppet. He used Tachibana to capture the Spider Undead and create the Leangle System, however, Tachibana escaped Isaka's control and sealed it away after discovering the truth about Sayoko's death. 
*Kazuma Kenzaki: Kazuma Kenzaki was the main obstacle in Isaka's plans, he repeatedly tried to prevent the Spider Undead's capture and save Tachibana from Isaka's control.
*Hajime Aikawa: Hajime Aikawa was momentarily an ally of Isaka, but he turned on him after Isaka tried to blow up Amane and Haruka, he later faced Hajime and nearly killed him with Tachibana's help.
*Sayoko Fukasawa: Sayoko tried to save Tachibana from Isaka's control several times, this eventually resulted in Isaka killing her with an Air Blast.
*Spider Undead: Sealing the Spider Undead was Isaka's main goal so he could create Kamen Rider Leangle, he ended up using Tachibana to seal the Spider Undead.
==Behind the Scenes==
===Portrayal===
Isaka was portrayed by . As the Peacock Undead, his suit actor was , who is currently known as the suit actor of most Secondary Riders of Heisei Era Phase 2. The Peacock Undead, among other Undead, were Eitoku's earliest suit roles in the Kamen Rider Series.
===Concept Art===
==Notes==
*Isaka has the most amount of appearances of the Royal Club Undeads, with a total of 11 episodes.
*He is the only Category Jack Undead to not be sealed by Blade, but instead, his associated Rider, Garren.
==Appearances==
==Navigation==
Category:Villains
Category:Undeads
Category:Peacock Monsters
Category:Rider Creator
Category:Blade Characters
Category:Leader