While his Rider powers eventually end up turning him into a Joker over the course of the second half of the series, he uses this to force the Battle Fight into a stalemate and allow his friend Hajime to continue living among humans.
While transformed, he wields the Blay Rouzer (ブレイラウザー, Burei Rauzā) sword, which doubles as his primary weapon and a storage unit for his deck of spade-themed Rouse Cards (ラウズカード, Rauzu Kādo), which he can use to channel the Category Spade Undeads' powers to augment himself and perform special attacks.
Later in the series, Kenzaki gains access to the Rouse Absorber (ラウズアブゾーバー, Rauzu Abuzōbā) brace, which he can use in conjunction with the Absorb Capricorn (アブゾーブカプリコーン, Abuzōbu Kapurikōn) card and other special Rouse Cards to assume the following stronger forms: Kazuma Kenzaki is portrayed by Takayuki Tsubaki (椿 隆之, Tsubaki Takayuki).
After learning from a Karasuma body double that his subconscious fears are causing his condition, Tachibana joins forces with Isaka in exchange for Schuld Kestner seaweed to cure himself despite it intensifying his aggression and slowly damaging his nervous system.
While transformed, he wields the Garren Rouzer (ギャレンラウザー, Gyaren Rauzā) handgun, which doubles as his primary weapon and a storage unit for his deck of diamond-themed Rouse Cards, which allow him to channel the Category Diamond Undeads' powers to augment himself and perform special attacks.
In an alternate ending depicted in the film Kamen Rider Blade: Missing Ace, Kenzaki seals Hajime, though he eventually frees him four years later to help defeat the Albino Joker.
Unlike the BOARD-sanctioned Riders, Hajime utilizes the Chalice Rouzer (カリスラウザー, Karisu Rauzā) belt, which allows him to transform into sealed Undead via their corresponding Rouse Cards.
While transformed, he wields the bladed Chalice Arrow (カリスアロー, Karisu Arō) bow, which can switch between Rouzing Bow Mode (醒弓モード, Seikyū Mōdo) and Blade Mode (ブレードモード, Burēdo Mōdo) as well as serve as a storage unit for his heart-themed Rouse Cards, which allows him to channel the Category Heart Undeads' powers to augment himself and perform special attacks.
While transformed, he wields the Wild Slasher (ワイルドスラッシャー, Wairudo Surasshā) kama, which he can either wield in their twin Rouzing Sickle Mode (醒鎌モード, Seiren Mōdo) or combine with the Chalice Arrow to access the former's Rouzing Bow Mode, and can fuse all of his Rouse Cards into the singular Wild (ワイルド, Wairudo) card.
While transformed, he wields the Leangle Rouzer (レンゲルラウザー, Rengeru Rauzā) staff, which doubles as his primary weapon and a storage unit for his deck of club-themed Rouse Cards, which he can use to channel the Category Club Undeads' powers to augment himself and perform special attacks.
During the events of the stage show Kamen Rider Blade 20th Anniversary Stage, Mutsuki gains access to his own Rouse Absorber, which he can use in conjunction with the Absorb Tiger (アブゾーブタイガー, Abuzōbu Taigā) and Evolution Tarantula (エボリューションタランチュラ, Eboryūshon Taranchura) cards to assume his own King Form that fuses him with the rest of his Rouse Card deck and grants the use of a spear version of the King Rouzer.
The Categories Jack, Queen, and King Undead are all capable of disguising themselves as humans and possess higher forms of thought compared to their weaker feral brethren.
Additionally, despite possessing an equivalent amount of power as the other Royal Club Undead and being among their kind's greatest warriors, the Category Aces lack the ability to shapeshift.
The Category Jack of Diamonds: Peacock Undead (ピーコックアンデッド, Pīkokku Andeddo), also known by his human alias of Isaka (伊坂), is the creator of the Rider System 03.
The Category Ace of Clubs: Spider Undead (スパイダーアンデッド, Supaidā Andeddo) is Isaka's accomplice who can produce webbing from his mouth capable of siphoning victims' life forces.
Initially working to find ideal hosts for Rider System 03, the Spider Undead eventually allows itself to be partially sealed by Mutsuki Kamijo so it can possess him in the hopes of winning the modern Battle Fight.
The Category King of Diamonds: Giraffa Undead (ギラファアンデッド, Girafa Andeddo), also known by his human alias of Kanai (金居), is a stoic individual and the first to learn that the modern Battle Fight is being fought under false pretenses.
While transformed, he wields the Glaive Rouzer (グレイブラウザー, Gureibu Rauzā) sword, which allows him to perform the Gravity Slash (グラビティスラッシュ, Gurabiti Surasshu) finisher.
While transformed, she wields the Larc Rouzer (ラルクラウザー, Raruku Rauzā) crossbow, which allows her to perform the Ray Bullet (レイバレット, Rei Baretto) finisher.
While transformed, he wields the Lance Rouzer (ランスラウザー, Ransu Rauzā) spear, which allows him to perform the Impact Stab (インパクトスタッブ, Inpakuto Sutabbu) finisher.