Mirage Studios is an independent American comic book company founded in 1983 by Kevin Eastman and Peter Laird in Dover, New Hampshire, and currently based in Northampton, Massachusetts. They are best known for the Teenage Mutant Ninja Turtles comic book series and the subsequent franchise it has spawned.
In 2009, it sold the rights to the Turtles franchise to Nickelodeon (owned by Viacom, now ViacomCBS). 
Mirage Exclusive Characters
Krang (Background Character)
The Foot Clan (Background Clan)
The Shredder (Background Character)