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Dr. Eggman
No, Dr. Eggman is the ancestor of Eggman Nega, as revealed in the Sonic Rivals series. Dr. Eggman Nega despises him due to his constant failures when facing Sonic the Hedgehog, scarring his family name.
Eggman's original name was Dr. Ivo Robotnik.
Dr. Eggman is 47 I should know I researched him.
No! Shadow was created by Eggman not Sonic.