|Organization||Goha Enterprises (Department of Energy, Energy Development Department, Gohanium Section)|
|Anime debut||Yu-Gi-Oh! SEVENS episode 07171: "Danger: Do Not Mix"|
Dr. Delta is a tall skinny man with sallow skin, ruddy bulbous nose and light brown hair that sticks up behind his ears and a triangular mustache. He wears a labcoat open over a white collared shirt, a dark grey tie emblazoned with the Goha Enterprises label, grey pants, and black shoes. He also wears red rimmed sunglasses.
Delta, Gamma and Zeta were conducting an experiment in the Gohanium Section when returning employee Mimi Imimi arrived, though they didn't answer her query as to her job in the section. They received an email from Gavin Sogetsu explaining that Romin Kassidy's Dragias Curry and Prima Guitarna Curry could produce an explosion strong enough to destroy the Goha Enterprises Main Office, and decided to see if they could use it for their experiments. When Romin confronted Mimi over not eating her curry and the Chef Drones agreed to let them Rush Duel over it, Delta eagerly offered their Explosive-Proof Laboratory for them to Duel in. Gavin arrived with new employees Yuga Ohdo and Lucidien "Luke" Kallister to watch the Rush Duel, fearful of the prospect, though Delta assured him there was no safer place. During the Rush Duel, a droplet of the two curries mixed and detonated, blowing out the reinforced glass of the laboratory, much to the joy of Delta, Gamma and Zeta. Romin eventually defeated Mimi, so Delta, Gamma and Zeta eagerly took all the curry to experiment on. However they were interrupted by a starving Luke, who dived towards the pots and combined them, producing an explosion that devastated the lab.
Delta, Zeta and Gamma later had Mimi assist them with a kinetic energy experiment, observing her performance as she rode an exercise bike and waving to Luke, Swirly, Masahiko, Toshihiko and Mimi's son Yosh when they visited.