Dr. Eggman Nega

Dr. Nega is a mysterious villain who has drove the Zone Cops into war with him and destroyed most of the No Zone in the process. Sonic the Hedgehog has confronted this new threat before and fortunately, escaped safely. (StH: #197 SU: #1)

Dr. Nega's full name is Eggman Nega, but can't be used and only referenced as of now because of SEGA.