Alyson Hannigan 1989, her first regular role on a TV series came when she was cast in the short-lived ABC sitcom "Free Spirit". As a teenager, Hannigan babysat for the children of her future "How I Met Your Mother" costar, Bob Saget. In 1997, Hannigan was cast to play Willow Rosenberg, Buffy Summers' best friend, on the television series "Buffy the Vampire Slayer". The show became a success, and Hannigan gained recognition, subsequently appearing in several films aimed at teenaged audiences, including "American Pie" (1999), "Boys and Girls" (2000), "American Pie 2" (2001), and "American Wedding" (2003). She also had a guest
Drusilla (Buffy the Vampire Slayer) dialogue. Drusilla's costumes were initially intended to be a "cross between a Victorian period look and the Kate Moss heroin chic fashion look," says Landau. Drusilla appeared in 24 Buffyverse episodes: Other stories featuring Drusilla include "The Problem With Vampires", from the 2004 comic mini-series "Tales of the Vampires". Drusilla appears in a number comics/novels of the Buffy/Angel expanded universe. She appears notably in her own mini-series: "Spike & Dru". Drusilla (Buffy the Vampire Slayer) Drusilla, or Dru, is a fictional character created by Joss Whedon and David Greenwalt for the American television series, "Buffy the Vampire Slayer" and "Angel".