Courtney and I both chose The Library At Mount Char. I'm not sure that you could really consider any of the characters in the book anything other than villains, but they're also all, to some degree or another, sympathetic at some point. Read my review (linked above) for more details.
Stephanie read The Fixer by Jennifer Lynn Barnes, about a girl who becomes a "fixer" for high school students, like her older sister and guardian is a "fixer" for politicians. Stephanie compared it to a combination of Scandal and Veronica Mars, which sounds pretty intriguing. She loved it and highly recommend it.