Daniel "Oz" Osbourne is a fictional character created by Joss Whedon for the cult television series Buffy the Vampire Slayer. The character is portrayed by Seth Green. Green also portrays the character in one episode of spin-off series Angel.
In Buffy, Oz is portrayed as a taciturn, guitar-playing teen who becomes boyfriend to Willow (Alyson Hannigan), one of the show's main characters. After first appearing in the episode "Inca Mummy Girl," Oz discovers he is a werewolf in the episode "Phases" and becomes a recurring character throughout the second season. Green is elevated to main cast for the third season, and departs from the series in season four. Green portrays the character for a final time in the season four finale "Restless" as part of a dream sequence. The character made a brief canonical 'return', however, in the 2009 Buffy the Vampire Slayer Season Eight storyline "Retreat".
Oz's most outstanding trait is his detached, ironic approach to life, masking a deeply philosophical interior. He is also the lead guitarist for the band Dingoes Ate My Baby, which performs frequently at The Bronze. A high school senior, one year above Willow and the rest of the group, he "tests well", but his only real ambition lies in his music.
He notices Willow in her Eskimo costume at a dance at The Bronze, and seems to be interested in her at first sight; but does not meet her directly until several episodes later. They go into, according to Willow, "some sort of holding pattern, except without the holding or ... anything else," even though they have several dates, on one of which he witnesses a vampire being dusted by Buffy for the first time, and thus becomes a member of the Scooby Gang. He is unsurprised upon learning vampires exist and merely remarks that "it explains a lot." He and Willow eventually share their first kiss and become a couple at the end of the season two episode "Phases."
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Official Site: 20th Century Fox
Links: Wikipedia Entry Buffy Guide.com IMDB Link