Oz's (Seth Green) departure is a big surprise on Buffy The Vampire Slayer since the character is a memorable part of Buffy Summers's (Sarah Michelle Gellar) Scooby Gang from the beginning. Throughout his time on the TV series, Oz dates Willow Rosenberg (Alyson Hannigan) and adjusts to the fact that he is a werewolf. His storylines are always as funny as they are exciting since he has a goofy, warm personality.