Which running back, nicknamed "Kansas Comet," starred for the Bears in the 1960s?

Which Chicago Bears legend was known as "The Galloping Ghost"? Which quarterback was nicknamed "The Gunslinger"? Which tight end is known by the nickname "Gronk"? Which Steelers quarterback was nicknamed "Big Ben"? What was the nickname of the Pittsburgh Steelers' 1970s defense? What was the nickname of the Minnesota Vikings' 1970s defensive line? What was the nickname of the Los Angeles Rams' 1960s defensive line? What was the nickname of the Seattle Seahawks' secondary in the 2010s?