The trope that used to be called "Red Baron" is called Sobriquet here. If you had actually looked at the page we have on the historical Red Baron you would have seen a note to that effect at the end of the main text.
Please do not link to the fandom.com wiki just to use the old name of a trope. As you might imagine, it will cause considerable confuston.
-- Looney Toons, admin
CC: @Labster, @Robkelk, @QuestionableSanity, @Derivative, @SelfCloak, @GethN7