Katsumi Ninomiya

Katsumi is Katsuko's sister and a farm girl from Okinawa. Katsumi took up training from her father in order to get really strong and also be able to provide food for herself for when the time was needed. In the years that Katsuko started dating Akira, Katsumi took up on Swordsmanship in order to be able to protect her sister. Katsumi has been in Okinawa since the Okinawa OVA but will return in Season 2 Arc 3.

Appearance
Katsumi has a tan tint to her skin from all the farm work she did for her father and has kept on working since then. She has a large set of breasts which immediately drew in Duke Devlin to her. She is usually wearing a small black top along with black baggy pants like cargo pants. Her sword is always strapped by the left side of her waist.

Okinawa OVA
Katsumi debated with herself on whether she should take her father's side or her sister's side in the argument about Akira. Katsumi realized that she had been traveling with her sister in order to protect her so it didn't matter who Katsuko had married.

Katsumi's Death
Katsumi dueled against a duplicate of Nobuyuki in one of the tunnels. However, she lost, and the tunnel was flooded in blood, drowning her and the others with her.

Relations with Others
Katsumi really only has relations with her sister, Akira, and Duke, though she does show some interest in some of the other characters.

Katsuko: The reason that Katsumi is traveling around. Since Katsuko didn't take up the training with her father, Katsumi makes sure that Katsuko is safe at all times.

Akira: Katsumi's brother-in-law. Though Katsumi really doesn't approve that Akira will be a good provider for Katsuko, Katsumi notices how well her sister and Akira get along with each other and decides that it's fine as long as she keeps her sister safe.

Duke Devlin: The boy who is attached to Katsumi for her large breasts. Katsumi and Duke duel and if Duke won, she would go out with him, which he did win.

Ryouta: Katsumi and Ryouta are alike for they each have someone to protect and each have the same interests in Swordsmanship. When Black-Winged Dragon lost its Signer powers to Tenjou, Katsumi decided to give the Blackwing deck over to Ryouta in return of a Six Samurai/X-Saber deck.

Decks
Katsumi has had 2 different types of decks.

The first was a Blackwing Deck, which was structured around swarming to the field for quick Synchro Summoning.

The other was a Six Samurai/X-Saber deck, which relied on the effects of the Six Samurai monsters as well as the swarming of the X-Saber monsters for summoning the X-Saber Synchro monsters.