Name:Gerald Robotnik
Age: 50
Height: 1,70 meters
Weight: 88 kilos
Known hobbies: Experimenting

Gerald Robotnik Bio
Professor Gerald Robotnik is the grandfather of Maria Robotnik and Dr. Ivo Robotnik, also known as Doctor Eggman, as well as the creator of Shadow the Hedgehog, Space Colony ARK, the Biolizard, Artificial Chaos, and various others. According to Sonic X, Gerald was 170 cm (5ft 7in) tall and weighed 88 kg (195 lb). He was voiced by Marc Biagi in Sonic Adventure 2 and by Mike Pollock in Shadow the Hedgehog in English, and Chikao Otsuka in Japanese. After launching the ARK fifty years before the main series, the current president of the United Federation came forth and requested his expertise on a project involving prevention of death: an immortality formula. He was reluctant at first, but his granddaughter Maria Robotnik had been suffering from an illness known as Neuro-Immune Deficiency Syndrome, which had no known cure. Knowing that otherwise she might die, Gerald reluctantly agreed to work on the project.

While he himself called it the Ultimate Life Form, his doubtful coworkers frequently referred to it as "Project Shadow", due to its high impossible goal, akin to catching one's shadow. The name stuck, and eventually Gerald officially referred to the project as Project Shadow. After various attempts, some reaching results such as the dangerous Biolizard, he contacts the alien Black Doom and, with his DNA, he would finish the ultimate lifeform: A creature who wouldn't age even from time itself, Shadow the Hedgehog. Shadow's purpose was to serve both of them, as part of an agreement: Gerald would have Shadow to further his research, while Black Doom would have Shadow to collect the Chaos Emeralds for his own secret and sinister purposes: to use Chaos Control to bring the Black Comet, the home of his alien species the Black Arms, down to Earth and conquer it. Once Gerald learns of Black Doom's intentions he creates his own plan; he creates the ARK's Eclipse Cannon to destroy the comet that Black Doom travels in.

As revealed in Sonic Battle, at some point during his time working on Project Shadow, he also came across an ancient robot known as the Gizoid, which was able to copy melee and weapon abilities and use them. When the government and its military organizations became uneasy about Project Shadow, believing that is could be a potential threat to Earth, Gerald gave them the Gizoid to buy some time in completing his work. However, this did not change their feelings about Project Shadow. Sometime after the creation of Shadow the Hedgehog, G.U.N. attacked the ARK. Maria was killed and Shadow was launched toward Earth.

It was also revealed in Sonic Rivals 2 that he had been researching a creature called the Ifrit for unknown reasons.

When the professor found out that Maria was killed by the G.U.N. military, he lost his grip on sanity. During his remaining time, he created a program that would smash the ARK into the Earth, destroying it, and tampered with Shadow's memories so that he would carry out the plan. In order for the program to work, it needed to be powered by the seven Chaos Emeralds. His final act before his video recorded execution was to condemn the world to destruction for the pain humanity has caused him.