Dr. Eggman

Dr. Eggman Robotnik is the main villan in the Sonic series of games and animated series. He is a cyborg, obese, and heavily uses robot technology. He usually flies around in an egg-shaped craft, but has created more advanced fighting machines. Because he tends to bumble alot, Sonic has occassionally called him "Robuttnik". Fans have either called him Robotnik or Eggman.

Eggman's grandfather is Dr. Ivan Robotnik and has been referred to as Dr. Robotnik, referring to the current Robotnik as Eggman for distinguishing purposes.