Widely Hated
Everyone has their favorites and least favorites, of course. But it must be said that some characters are less popular than others. And these ones in particular have very few if any fans or advocates. Whether for being seen as poorly written, annoying, morally repugnant, or some other reason, these are the characters who, near as I can tell, are the most widely hated and/or infamous for being widely hated.
For characters who have comparable numbers of vocal fans and defenders, see my "Bitterly Divisive" list.