Gerald Robotnik

Name:Gerlad Robotnik
Nickname:grandfather (called this by Eggman)
Age:unknown
Species:Human

First Game:Sonic Adventure 2 (Dreamcast)

Gerald is Eggman's and Maria's grandfather. He was in charge of Project Shadow and space colony ARK. He went insane when Maria died. He attempted to destroy the planet with both the ARK and the Biolizard.