A dependable friend (much like the dog Clifford, from the children's book "Clifford The Big Red Dog"). Someone who gets to the point quickly (much like Cliff Notes, a series of study guides to explain complex literary works). A beer drinker (much like Cliff Clavin, a character from the TV series "Cheers"). A family man (much like Cliff Huxtable, a character from the TV series "The Cosby Show"). A protector (much like the security company "CLIFFORD").
That guy Cliff really is dependable, he saved us there with his notes, we finished studying so early we went out for beers after.