Nistro

He is Dr. Faker's right-hand man and a committee member responsible for maintaining the World Duel Carnival. He works together with Droite for Mr. Heartland along with Kaito Tenjo. Opposite to Droite's cold-blooded personality, Gauche is a very high-spirited person. His true purpose is to investigate and organize Numbers holders.

(Source: Yu-Gi-Oh! Wikia)