Named for the Ace Pilot, Manfred von Richthofen, who was known as "The Red Baron" during World War I.
He was best known for having the highest kill count of any flyer in the war and for his bright red Fokker tri-plane.
The full trope embodies two principles: Compare with Fan Nickname, where the fans come up with a nickname that isn't used in the series.
The Butcher is a subtrope where the nickname typically refers to the character's violent nature or dark acts.
This elegantly simple binary imprint has become so prominent that we have lost sight of the larger holographic spell that spawned it.