Roku

Roku, known as Rokujuro in the Japanese version, is a character in Yu-Gi-Oh! ZEXAL. He is an elderly man who is the owner of a Duel Sanctuary in the mountains around Heartland City.

Etymology
His name can refer to six in Japanese.

Biography
During Yuma's stay at his Duel Sanctuary, he taught Yuma about Duel Monsters - how they are alive and, specifically, about how they put their life on the line for their Duelist. His teachings influence Yuma's Dueling, making him protect his monsters more during his Duels, and treating them as his comrades.

After watching Yuma's Duel with Kaze, he gives Yuma the Deck that Kaze was searching for.

When he returned to visit Yuma, he is angry of the decision Yuma was making and challenged him to a Duel. Once he defeated Yuma, he told him he tried to use his father as an excuse. After more words, he tells Yuma that he should stick to Dueling instead of running away, and was happy when Yuma agreed. Roku is also aware that Mr. Heartland is using the WDC as a cover and is being used by Dr. Faker.

Statue
In Statue Duels, Roku uses a Wooden Training Deck consisting of "Statue" monsters and other wooden cards. Other than the cards he used, he has other "Statue" cards, some of which were used by Yuma and others of which are seen in the Duel Sanctuary.

Poker Knight
Roku plays a Poker Knight Deck in typical Duels.