Speaking of "Lucy", in the novel I felt that she was a tragic character. She was a beautiful young woman who had three men competing for her love (a psychiatrist named John, an American cowboy named Quincy, and a lord named Arthur).
When Dracula killed her and turned her into a vampire the three men who each loved her had to team up with Johnathan Harker and Van Helsing to hunt her down and kill her (again) in order to free her from her vampire existence.
It was sad.