Eggman Nega

Eggman Nega, also known as Dr. Nega, is a recurring villain from the Sonic the Hedgehog series. He comes from a different dimension that is actually the future and is the direct descendant of Dr. Eggman. Blaze the Cat, Silver the Hedgehog, Shadow the Hedgehog, and Sonic the Hedgehog are his main foes.

Mario & Sonic at the Olympic Winter Games
Eggman Nega appears as a rival in the Festival Mode of the Wii version of Mario & Sonic at the Olympic Winter Games. He is faced in the Ski Cross event.

In the DS version Eggman Nega appears in the Adventure Tours mode and is faced in the Nordic Combined and Skeleton events.

Mario & Sonic at the London 2012 Olympic Games
Eggman Nega returns as a rival in the Wii version of Mario & Sonic at the London 2012 Olympic Games. He appears as an NPC in the London Party mode and must be spoken to by the player in order to be versed. In the first match he is faced in the Fencing event, but subsequent rematches pit him and the players in Dream Fencing events.

Eggman Nega appears in the 3DS version as a rival in the 4x100m Relay event.

Mario & Sonic at the Sochi 2014 Olympic Winter Games
Eggman Nega appears in Mario & Sonic at the Sochi 2014 Olympic Winter Games as a rival in the Legends Showdown mode.