Mr. Kay

Ukyo Kitano is a character appearing in Yu-Gi-Oh! ZEXAL. He is a professor at the junior high school Yuma Tsukumo attends, and is one of the characters possessed by the "Numbers".

Deck
Professor Ukyo uses a Crashbug Deck revolving around Summoning his "Number" Xyz Monster, "Number 34: Terror-Byte". Much like the effects of his cards, his Deck represents what Ukyo has done- hacking into computer systems and taking control of them, launching "bugs" en masse, and wroughting many people (and the infected systems themselves) trouble because of it all.