Oka Reiko

Oka Reiko was first introduced in the Duel Masters Versus season of the Duel Masters Anime.

Plot
She was a ghost Dragon Ryu encountered when he was working as a ghost buster. She later accompanied Dragon Ryu and worked as his assistant in his oden store "Donguri-ya".She first made an appearance with Ryu in episode 8,helping him to clean the utensils and Katta Kirifuda noticed her. She supported him during his duel against Katta.

In episode 17,she dueled Katta in Dragon Ryu's house and used a mono Darkness deck. However,Katta defeated her by using his Gaial Mobius, Victory Emperor.She retreated to the room and both she and Dragon Ryu gave Katta and his friends a surprise party. It was revealed that she dueled Katta in order to buy time for Ryu to prepare for the surprise party and scares Hokaben to get him out of the way.

In episode 30,she,Ryu and Katta were brought to a deserted island. In the second day,she supported Ryu and was also part of the duel. Both of them lost to Katta new Dragheart cards and left the island by motorboat after Katta and Hamukatsu fell under the canopy trap.

Deck
Like Dragon Ryu,she uses a mono Darkness deck centered on Funky Knightmares and the Darkness incarnations of Ryusei.