Gansley, known as Konosuke Oshita in the Japanese version, is the former vice-president of KaibaCorp and the leader as well as the founder of the Big Five.

Gansley is obsessed with business, and as such refers to his monsters as employees. In the Japanese version, he quotes various warlords and philosophers on how to build a successful army. In the English dub, he gives Yugi Muto advice on business.

In the Japanese version, Gansley knows of Yami Yugi's existence and refers to Yugi as Type-A and Yami Yugi as Type-B Yugi. In the English version, Gansley shows no knowledge of Yami Yugi.