Kog

Kog is a silver and green robot with red eyes and was the first robot made by Doctor Kintobor who was shut down and forgotten about before his creator was changed into Robotnik. Many years after he was accidentally activated by a badnik attack on the former Citadel Robotnik site, which was being bulldozed at the time. After some confusion amongst the construction workers Kog was given a job as a tour guide teaching Mobians what the world was like before Robotnik ruined it.