Mellow Rush
 
 
Little is known about the Steam user Mellow Rush. Some say he's just a myth. Others contend that he's very real and that they've actually seen him with their own eyes trying to quickscope with the Dragonov in Modern Warfare 3. And though his current name is an obscure reference to the TV show Psych, his profile shows many incredibly edgy names as possible previous alter-egos. It's not clear whether these are all the same man, or just a collection of disparate monikers attributed to one legendary figure.

What is known, however, is that regardless of whether or not he's real, someone has definitely put a lot of time into Factorio on this account.