Gansley known in Japan as Konosuke Oshita is the leader and founder of the Big Five in the Yu-Gi-Oh! anime. He is bald except for the gray hair on the side of his head and is the oldest as he has a cane.

He is voiced by Nobuyuki Saitou and dubbed in English by Marc Thompson.


Gansley's business career began with a lemonade stand that he stole from his neighbor. He soon became the biggest lemonade distributor, and then started working for Gozaburo Kaiba at Kaiba Corp. With the other four members of the Big Five, Gansley conspired with Kaiba to take over Kaiba Corp and overthrow Gozaburo. Their plan succeeded but Kaiba betrayed them so when Pegasus J. Crawford attempted to take over Kaiba Corp, the Big Five joined forces with him to help him. After Pegasus was defeated by Yugi in a duel, Kaiba fired the Big Five, but they trapped him in his own virtual world and attempted to sacrifice him to the lava pit to awaken the Five Headed Dragon. When Yugi Muto, Joey Wheeler, Mai Valentine, and Mokuba Kaiba entered the game, the Big Five summoned the Five Headed Dragon themselves. Gansley appeared to control its center head and killed Joey, Mai, and Mokuba (from which they were later revived), but when Yugi and Seto combined their monsters to destroy the Five Headed Dragon, the Big Five were imprisoned in the virtual world.

Gansley Deepsea warrior

Gansley as Deepsea Warrior.

They were there so long their bodies were destroyed til they found Noah Kaiba and entered his virtual world. They agreed to defeat Yugi, Seto Kaiba and the others as they needed to steal their bodies to escape.

Gansley took the form of Deepsea Warrior and dueled Yugi. His deck is water themed, and he was able to sacrifice two monsters to create a barrier to reflect any of Yugi's attacks back at him. However, with Kuriboh as his deck master (though Yugi intended to choose the Dark Magician), he was able to attack Gansley directly and defeat him.

Gansley was digitized but not destroyed; he later returned alongside his defeated comrades Crump, Johnson and Lector attempting to steal the bodies of Joey, Serenity and Duke. Gansley broke up a fight between Adrian and Lector before Noah recalled them as they had not won the bodies in a duel.


Noah imprisons the Big Five.

Eventually they all entered Taylor's body, which had been stolen by Nesbitt. They dueled together against Yugi and Joey, rotating around. He was only dueling for one turn before Adrian took over. Yugi and Joey defeated the Big Five. They attempted to steal the gang's bodies again but Noah sent them back to his room. They begged him for another chance but he gave them no more chances and deleted/killed them. 

In the 4Kids English dub, Noah imprisoned them each in a different corner of the virtual world. Gansley was killed along with Noah, Gozaburo and the other members of the Big Five when Noah caused a satellite attack that destroyed the fortress that the virtual world was stationed in, deleting the virtual world and anyone in it.


As a businessman, Gansley knows many business strategies but is quite unethical in his business career as he would fire his workers for no reason and began his business career by stealing a lemonade stand from his neighbor. He also seems to be one of the better duelists of the Big Five, as he came close to defeating Yugi, apparently having analyzed every aspect of the duel but underestimated Kuriboh which led to his downfall.

Yu-Gi-Oh! The Abridged Series

In LittleKuriboh's parody Yu-Gi-Oh! The Abridged Series, Gansley's role is mostly similar to his role in the anime, except that he (and the others in the Big Five) are part of 4Kids out to cancel the Abridged Series due to the word "Disney" being mentioned. He was defeated by Yugi, but returned to chase after Joey, Serenity, Tristan, and Duke. After all the Big Five were defeated by Yugi and Joey, Noah punished them by banishing them to the darkest corners of the Internet. Gansley was sent to Megaupload, which was empty.


           Yu-Gi-Oh logo Villains

Dark Yugi | Shadi | Seto Kaiba | Mokuba Kaiba | Yami Bakura | Maximillion Pegasus | Croquet | Pegasus' Guards | Duke Devlin | Marik Ishtar | Yami Marik | Odion Ishtar | Mr. Ishtar | Weevil Underwood | Rex Raptor | Paradox Brothers | Bandit Keith | Sid | Bonz | Zygor | Panik | Gozaburo Kaiba | Thief King Bakura | Jinzo | Diabound | Zorc Necrophades
Rare Hunters
Arkana | Strings | Seeker | Lumis and Umbra
Big Five
Gansley | Crump | Johnson | Nesbitt | Lector

Television Only
Yu-Gi-Oh! Duel Monsters
Noah Kaiba | Zigfried von Schroeder | Leon von Shroider | Imitator of Death | Witty Phantom
Dartz | Rafael | Alister | Valon | Gurimo | The Great Leviathan

Yu-Gi-Oh! GX
Vellian Crowler | Jean-Louis Bonaparte | Zane Truesdale | Brron | Zure | Kozaky | Chaos Sorcerer | Mr. Shroud | Trueman | Mad Dog | Sartorius Kumar | Sarina Kumar | Light of Destruction | Thelonious Viper | Trapper | Adrian Gecko | Echo | Yubel | Supreme King | Guardian Baou | Skilled Dark Magician & Skilled White Magician | Three Masked Knights | Jinzo | Sacred Beasts | Chaos Sorcerer | Sky Scout | Skull Knight
Shadow Riders
Kagemaru | Nightshroud | Camula | Tania | Don Zaloog and The Dark Scorpions | Abidos the Third | Titan | Amnael

Yu-Gi-Oh! 5D's
Rex Goodwin | Roman Goodwin | King of the Netherworld | Kalin Kessler | Devack | Greiger | Sayer | Professor Frank | Mr. Armstrong | Z-one | Don Piero | Lester, Primo, and Jakob | Lazar | Aporia | Rudolph Heitmann | Carly Carmine | Misty Tredwell | Lawton | Barbara | Malcolm | Radley | Earthbound Immortals
Dark Signers
Rex Goodwin | Roman Goodwin | Devack | Greiger | Kalin Kessler | Misty Tredwell | Carly Carmine
Z-one | Aporia (Lester, Primo, & Jakob) | Paradox | Vizor

Yu-Gi-Oh! Zexal
Don Thousand | Dr. Faker | Mr. Heartland | Number 96 | Quattro | Nistro | Vetrix | Triad of Terror (Wolfsbane, Coyote, Jackal) | Parker | Quinton | Erazor | Chironex | Scritch
Seven Barian Emperors
Vector | Reginald Kastle/Nash | Rio Kastle/Marin | Alito | Mizar | Dumon | Girag

Yu-Gi-Oh! Arc-V
Leo Akaba | The Doktor | Barrett | Silvio Sawatari | Yuri | Jean-Michel Roget | Sergey Volkov | Lucas Swank | Z-ARC

Yu-Gi-Oh! Vrains
Varis | Specter | Dr. Kogami | Faust | Baira | Dr. Genome | Pandor | Queen | Shepherd | Bohman | Harlin | Lightning | Windy | Roboppy | Ai
The Knights of Hanoi
Varis | Specter | Dr. Kogami | Faust | Baira | Dr. Genome | Pandor

Aileen Rao | Kekeru Goyu | Tetsu Trudge

Anubis | Paradox | Diva

Manga Only
Mr. Karita | Yako Tenma | Mr. Clown | Ahmet | Tragoedia | Luna | Leo

Card Games
The Lswarm | The Construct | Tierra | Trishula, Dragon of the Ice Barrier

Video Games
Scott Irvine

Community content is available under CC-BY-SA unless otherwise noted.