Azumi

The Serpent Undead, also known as Azumi in her human form, is the Category Queen of Diamonds Undead and a major antagonist in Kamen Rider Blade.

Kamen Rider Blade
Assisted by the Tortoise Undead, Azumi went searching for the Joker Undead. She was wounded by Ryo Mikami before being sealed by Chalice. Chalice later gave the sealed Absorb Serpent card to Garren to successfully assume his own Jack Form.

OOO, Den-O, All Riders: Let's Go Kamen Riders
In the alternate future where Shocker achieved their goal of world domination and defeated the Double Riders, the Serpent Undead was one of the many monsters in service to the evil organization. In the final battle she is seen fighting Kamen Rider Black and Kamen Rider RX.