Chameleon Undead

Chameleon Undead is an Undead whose capable of imitating it's appearances and it's ability from anyone he sees.

History
Hiroshi Tennoji had this Undead in it's sealed form and fused it with the Poison Scorpion Rouze Card to create Titan Undead but however it was splitted again and resealed.

Kamen Rider Blade: Day After Tomorrow
A year after Kenzaki's sacrifice into Navy Joker, he was unsealed again by Tachibana and Chief Karasuma under the intention to transfer a bit of his ability to the Jokers in order to turn them into normal humans but it escapes and steals the BOARD data and transforms into the imitation of Kamen Rider Blade and chasen after Hajime due to his nature of being a Battle Fight competitor. While everyone is throwing a graduation party for Mutsuki and Nozomi, Blade burst in from the front door and attacks Hajime. Everyone is confused but then Garren shows up in the window and starts firing Blade.

After explaining everything, he hands over Hajime and Mutsuki’s cards and the Leangle Buckle as they fight the fake Blade, but it transforms into Jack Form. Mutsuki remains useless as none of his powers grants him the ability to fly.

Tachibana warns Hajime as the Chameleon Undead has all of the BOARD data making it easy for him to fight. The Chameleon Undead transforms into King Form and finishes off the Riders.

With all of hope seems lost, Hajime even forced himself to evolve into Joker Undead but the fake Rider itself outsmarts him leaving a heavy wound on his chest.

As the Rider about to finish Leangle, Joker steps in and takes the blow. At first he thinks that it was Hajime/Chalice but it has no slash mark and he was lying after sustaining the damage on its chest.

Realizing the second Joker's true identity, Tachibana quickly tosses the Joker the Blay Buckle, Rouze Absorber and a collection of Suit of Spade Rouze Cards. Thus, the Chameleon Undead was defeated for good.

Gear & Accessories
Blay Buckle: Designated "Rider System 02", this transformation device was the second Rider System developed by B.O.A.R.D. intended as a means to combat the Undead via the fusion of Undead & human DNA. The Blay Buckle was designed for specific compatibility with the ♠A: "Change Beetle" Rouse Card and harnesses the DNA of the Beetle Undead. This model utilizes the "Turn-Up" mechanism to produce a stationary transformation screen, which initiates the fusion of Undead DNA with a human to produce the Kamen Rider transformation. More often than not, the transformation screen itself can act as a deflective wall against assaults.

Blay Rouzer: AP Cache: 5000AP; 7400AP (after initiating Jack Form) Blade’s primary armament; a hi-tech saber which serves as a weapon for combat and storage unit for Rouse Cards, including Proper Blanks. It has a built-in 'rousing' technology, which enables Blade to "rouse" the sealed Undead's power to utilize personally. Blade utilizes Rouze Cards' abilities by slashing the cards onto the blade's side, similiar to the Ryuki's Kamen Rider Alternatives' Slash Visor. After activating Jack Form, the Blay Rouzer gains an enhancement in the form of a blade extension. Its extended length aside, all of the standard features and functions remain intact, although now its AP Cache has been largely expanded.

Rouse Absorber A special accessory developed by Kei Karasuma to bolster the Rider’s capabilities. The Rouse Absorber was designed to be a supplementary Rouse device to Rider System and specialized container for the top category Rouse Cards. Its system was designed to harness the ♠J: "Fusion Eagle", ♠Q: "Absorb Capricorn" and ♠K: "Evolution Caucasus" Rouse Cards and is only compatible with those cards. Initiating either Jack Form or King Form, modifies the Rouse Absorber with a signature spade-plaque (a spade-eagle plaque for Jack Form; spade-Caucasus plaque for King Form). Though the Rouse Absorber is dubbed King Absorber henceforth, the modification, in either case, proves more cosmetic if anything.

King Rouzer AP Cache: 9600AP (Or maybe more) The King Rouzer is the signature armament of Blade in King Form. Modeled after the broadsword, the King Rouzer is Blade's most powerful Rouzer weapon given its size and weight. The King Rouzer's voice, when inserting a card, changes and states the card's catagory and number instead of stating the name . That aside, the King Rouzer functions as most Rouzer weapons, although its AP Cache has been given a much larger expansion. Where as Rouze Cards were roused by scanning the cards through the system, the King Rouzer does it differently by having up to five Cards be inserted into the slot where the blade of the Rouzer meets the grip.

Ace/Jack Form Combos:
(Jack) Lightning Blast Blade's signature card combo; The combo enables Blade to deliver a lightning-powered kick to his enemy, 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.
 * Cards Required: Kick Locust (♠5) + Thunder Deer (♠6)
 * AP Cost: 2200 (♠5=1000, ♠6=1200)

(Jack) Lightning Slash This card combo allows Blade to slash his opponent with his electric-powered Rouzer, 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.
 * Cards Required: Slash Lizard (♠2) + Thunder Deer (♠6)
 * AP Cost: 1600 (♠2=400, ♠6=1200)

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 allows Blade to do his lightning-back kick at subsonic speeds for an incredible impact.
 * Cards Required: Kick Locust (♠5) + Thunder Deer (♠6) + Mach Jaguar (♠9)
 * AP Cost: 3800 (♠5=1000, ♠6=1200, ♠9=1600)

Extreme Shot Was not used in the series, so this combo's abilities remain unknown, but considering the sheer amount of the AP this combo costs, it is possibly a last-resort attack, as it would nearly completely drain Blade's AP Cache in Ace form, with a mere 200 AP left.
 * Cards Required: Thunder Deer (♠6) + Fire Fly (♦6) + Tornado Hawk (♥6) + Blizzard Polar (♣6)
 * AP Cost: 4800 (♠6=1200, ♦6=1000, ♥6=1400, ♣6=1200)

King Form Combos:
Royal Straight Flush K-Blade's strongest and most used 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. It can be used as a laser blast from the King Rouzer or as a super-charged slash
 * Cards Required: Time Scarab (♠10) + Fusion Eagle (♠J) + Absorb Capricorn (♠Q) + Evolution Caucasus (♠K) + Change Beetle (♠A)
 * AP Cost: 11200 (♠10=1800, ♠J=2400, ♠Q=2000, ♠K=4600, ♠A=0)

Straight Flush This Rouse Combo summons the Blay Rouzer in addition to K-Blade's King Rouzer in a special dual-sword strike.
 * Cards Required: Slash Lizard (♠2) + Beat Lion (♠3) + Tackle Boar (♠4) + Kick Locust (♠5) + Thunder Deer (♠6)
 * AP Cost: 8000 (♠2=400, ♠3=600, ♠4=800, ♠5=1000, ♠6=1200)

Four Card This Rouse Combo borrows the Category 6 Rouze Cards from all 4 suits and amplifies their effects with the ♠K: "Evolution Caucasus". Its combo effect imbues King Blade with the evolved elemental powers of the Category 6 cards for a finishing strike.
 * Cards Required: Thunder Deer (♠6) + Fire Fly (♦6) + Tornado Hawk (♥6) + Blizzard Polar (♣6) + Evolution Caucasus (♠K)
 * AP Cost: 5600 (♠6=1200, ♦6=1000, ♥6=1400, ♣6=1200, ♠K=4600)

Straight Also known as Straight Tempest Crash, this is Blade's Rider Kick in King form. However, this is sadly never seen within the series, due to how the other Riders of the Blade series are.
 * Cards Required: Bullet Armadillo (♦2) + Screw Mole (♣3) + Float Dragonfly (♥4) + Kick Locust (♠5) + Thunder Deer (♠6)
 * AP Cost: 5600 (♦2=400, ♣3=600, ♥4=1000, ♠5=1000, ♠6=1200)

Full House This Rouse Combo is never shown in the series, but is seen in the DX King Rouzer toyline.
 * Cards Required: Any 3 same number cards + 2 other same number cards
 * AP Cost: Depends on the card