Crump

Adrian Randolph Crump III, known as Shuzo Otaki in the Japanese version, is a member of the Big Five. He was formerly a KaibaCorp accountant who oversaw the company's finances.

Personality
Crump is portrayed as the most comedic and high strung of the Big Five, as he shows exaggerated facial expressions when hit, or surprised like an animated cartoon character; compared to his fellows who all manage to stay serious during their fights while in Deck Master mode. In the Japanese version, Crump is shown as a pervert. He is also very cautious.

KaibaCorp
Crump was neglected as a child, but found a love for penguins when he read about how they cared for their young. His dream was to build a penguin theme park.

Crump, along 4 other KaibaCorp employees formed a group known as the Big Five. Crump worked as an accountant at KaibaCorp. Seto Kaiba, the adoptive son of the head of KaibaCorp, Gozaburo Kaiba, convinces the Big Five that Gozaburo is mistreating them and he'll help restore them to their former power. The Big Five agree, and thus buy 49% of KaibaCorp. Combined with 2% that Gozaburo had previously given to Seto for a test to prove his business skill, the Big Five vote out Gozaburo and vote in Seto as the president of the company.

However, Seto quickly backs out on their deal, stripping them of their power and leaving the Big Five little more than figureheads and consultants. An example is when Seto Kaiba refused to finance Crump's penguin dream theme park.

Duelist Kingdom
Furious over their betrayal, the Big Five strike a deal with the president of Industrial Illusions, Maximillion Pegasus in an attempt to overthrow Seto. If Pegasus defeats Seto and Yugi Muto in duels, then they will use their 49% to vote Pegasus into power of the company by kidnapping Mokuba Kaiba, who has been entrusted with the security codes to the two percent the Big Five need.

The Big Five and Pegasus' plan fails, after Pegasus is defeated by Yugi. In the manga, Seto fires them for their betrayal.

Legendary Heroes
In the anime, the Big Five avoid being fired, by making excuses and offering Seto his complete virtual reality game as a peace offering.

Eager to try out the virtual reality game, Kaiba refrains from immediately firing them and enters the virtual world. The Big Five trap Kaiba in the virtual reality.

However Kaiba is rescued by Mokuba, Yugi Muto, Joey Wheeler, and Mai Valentine. The Big Five reprogram the game and set the Mythic Dragon as the final boss. However it is defeated by Yugi and Kaiba's Dragon Master Knight.

Virtual Realm
After losing in Legendary Heroes, the Big Five got trapped in the virtual world, instead of Kaiba. Here they meet up with Noah Kaiba. Having Seto as a common enemy, they make plans to get revenge.

During the Battle City tournament, Noah has the KaibaCorp blimp sucked into an undersea fortress, where the virtual world's main servers are. They force Seto and Mokuba Kaiba, along with Yugi and his friends into the virtual world again. Using an altered set of Duel Monsters rules, involving Deck Masters, the Big Five duel their enemies in the hopes of stealing their bodies to escape the virtual reality.

Crump took the form of Nightmare Penguin to duel Téa Gardner. He calculated the odds of them dueling to be 100% and the odds of him winning to be 99%. As he lowered Téa's Life Points, she became engulfed in ice, but managed to defeat Crump, causing the ice to vanish.

Crump, along with Gansley, Johnson and Lector, having failed to win their targets bodies, go behind Noah's back and attempt to steal the bodies. They chase down Duke Devlin, Serenity Wheeler and Joey. As they argue over who gets which bodies, Noah makes contact and tells them off. Since Nesbitt didn't rightfully take Tristan Taylor's (as he had actually lost the duel, despite defeating Tristain) body, Noah allows the Big Five to share Tristan's body in order to Duel Yugi. Should they win, they would get their freedom.

The Big Five face Yugi and Joey, using Tristan's body. The 5, each switch control and Deck Master throughout the Duel. Crump took many of the early turns, as they were using an "A Legendary Ocean" strategy, which suited his Deck Master effect. Towards the end of the Duel, the Big Five uses "Dragon Revival Ritual" to combine their Deck Masters into the Mythic Dragon, "Five-Headed Dragon" again. The dragon is destroyed by Yugi and Joey's "Mirage Knight", but the Big 5 use "A Deal with Dark Ruler" to make "Berserk Dragon" their Deck Master. However it is destroyed by "Dark Magician Knight", costing them the Duel.

Noah refused to give the Big Five any more chances after that and left them trapped in the Virtual World. They have not been seen since. Later, when the virtual world was destroyed, everyone inside it at the time was destroyed with it, including the Big Five.

Deck
Crump uses a Penguin Deck that relies on various ice-themed cards. His Deck Master, "Nightmare Penguin", can increase the ATK of all WATER monsters.