Kanai is the human form of the Giraffa Undead, the Category King of Diamonds Undead and the last of the Royal Club to appear in the series.
Kamen Rider Blade
Posing as a human with eye glasses, he is the first Undead to learn the truth about the fake Undead battle and the last Royal Club Undead to be sealed.
He kills Tennōji, after using the Riders to fight for him, and steals the Kerberos card to possess the power to seal the Black Joker himself, black-mailing Hajime with the event of their fight tied to the death of Amane's father to finish the fight.
However, Garren intervene and battled the Giraffa Undead on his own, with his Garren Rouzer having no effect. The Undead was eventually sealed as Garren grabbed him and both plunged off the cliff they battled on.
Kamen Rider Decade: All Riders vs. Dai-Shocker
Giraffa Undead revived and join Dai-Shocker army.
OOO, Den-O, All Riders: Let's Go Kamen Riders
A category King Undead. In Let's Go Kamen Riders' altered timeline, like the other Undead, he follows Kerberus orders', and accompanies him to the meeting with Shocker.