Topic on User talk:HeneryVII
This is a permanent link to a single version of this post.
This version is from 3 years ago.
You can see the differences from the previous version, or view other versions on the post history page.
There is a page on All The Tropes that details Richthofen - I added an "appearances in fiction" list to it a couple of years ago. That page is called Red Baron.
The trope that you just described is called Sobriquet, after the word in the dictionary that has that definition.
EDIT: Looks like we posted at the same time.