Re: Most unpopular champion
Maybe not the most unpopular, but one of the least respected champions was surley Al McCoy, who held the middleweight title 1914-17.
McCoy is often referred to as the "original cheese champion".
First off all, he was a southpaw, which were not at all appreciated back then.
He also was not regarded as much of a fighter, his upset win over George Chip to win the belt was for many years regarded as one of the biggest upsets in boxing history.
McCoy also benefitted greatly from being a champion in the No Decision era, because his lost numerous newspaper decisions during his reign as champ but still held onto the belt.
Some of the guys McCoy lost NDs to during his stretch as "official champion", were Jack Dillon, Jimmy Clabby, Harry Greb and George Chip (in rematches).
Another great fighter of that era which would have been a huge favorite over McCoy was Les Darcy.
If there were any ratings back then, I doubt McCoy would be in the top 30.
No one was sorry when McCoy was finally KO'd in his fight with Mike O'Dowd in 1917 - not even McCoy's own father, who reportedly used to bet aginst his son.
McCoy is largely forgotten today, but he was a real nuisance back in the 1910's - probably much like John Ruiz was for us for a while.