Actor best known for his charismatic portrayal of Xander Harris, the heroine’s insecure sidekick, in Buffy the Vampire Slayer Actor best known for his charismatic portrayal of Xander Harris, the heroine’s insecure sidekick, in Buffy the Vampire Slayer As the lovable high school student Xander Harris, who just happens to be best friends with a superhuman vampire killer and a powerful witch in the cult American TV series Buffy the Vampire Slayer, Nicholas Brendon portrayed a flawed everyman that