Anitheroes: This may seem odd, but I like the crew from R. A. Salvatore's "War of the Spider Queen" series, particularly the perpetually-prepared scout Valas & the somewhat brash, wisecracking wizard Phaeraun. They're the main characters & could be considered heroes, but none are particularly "good", & almost all are vicious, scheming backstabbers.
Also, Robert Salvatore's dark-elven rogue Jarlaxle.
Heroes: Salvatore's Drizzt DoUrden & his companions, Clive Cussler's Dirk Pitt, Al Giordino, Joe Zavala & Kurt Austin, Kay Hooper's enigmatic FBI profiler Noah Bishop, James Patterson's Detective Cross, Jeffery Deaver's Lincoln Rhyme & Amelia Sachs.
Villians (a bunch): Salvatore always does this well (and Malice DoUrden may be the best villina name ever) with Malice & the many others. Cussler also usually is pretty good with villians: the thoroughly amoral Foss Gly is probably the best.
Deaver also does villians very well, & they're usually pretty scary (as in, you're GLAD it's only a book).