The old ones are the best. Monzon, Charles, Archie Moore, Greb, Walker, Tunney. These days they are really unoriginal.
I like some of the so called bad ones. Paul 'Scrap Iron' Ryan for example. Paul "Hoko" Hodkinson Steve "Stevo" Robinson Nigel Benn's 'The Dark Destroyer' always made me think of some kind of marital aid.
Before he changed it, "Railroad" Tye Fields was probably one of the lamest nicknames I'd heard. "Big Sky" ain't much better though. Fortunately for us, at this point it's probably "Big not on TV".
"Twin-Cycle Engine" has to be one of the worst ones. There was this african boxer, I cant remember his name but I think his nickname was "Crazy Hitler" or something like that haha
"The White Tyson" or "Little Tyson" ones are terrible, I'm surprised there isn't somebody called "The second coming of Naz" the amount of fighters that try to be like or are compared to him and fail epically. There will never be anyone like these fighters. 2 of my favourites of the top of my head are "the body snatcher" and "the dark destroyer" they are unique as far as I know too.