Dr. Ivo Robotnik, also known as Dr. Eggman, is the main antagonist of the Sonic series, and the last to die by the hands of Sonic.EXE.
Compared to regular Robotnik as he appears in classic Sonic titles, Soul Robotnik's skin has faded and paled, and his head is partially split open, revealing his brain. He lacks eyes and a skull, as his brain now covers the entirety of his upper head. His jaw hangs open limply, and his teeth are yellowed; one of which is missing entirely.
His arms are missing.