Laura Fraser's Lydia Rodarte-Quayle was a late edition to the world of Breaking Bad. However, that didn't prevent her from shooting dramatically to the top of the most annoying characters list. There is just something about her that grates on you. Maybe it's her excessive use of Splenda. It also could be that she is a total sociopath, who cares little about the carnage her actions bring about - as long as she doesn't have to get her hands dirty or see the bloody results. Whatever the case, Lydia was a character that people really rooted against. Nobody was crying when Walter finally got around to putting her down during the climactic episode of the series.