Seth Green plays the mysterious yet adorable Oz on Buffy the Vampire Slayer. His character is shy and quiet, and a perfect match for Willow. The two of them are slowly growing closer and closer together. Their relationship will provide a great side love story to the constant action on BTVS. Oz and Willow are very much alike. Both brains, computer nerds, and the actors that play them were both on My Stepmother is an Alien together.

After a scary first date at Buffy's surprise party, Oz has become one of the slayerettes. Now knowing about Buffy and vampires and all that. After finding out about Xander and Cordelia, Willow tries to use Oz as revenge towards Xander, but he catches on and tells her that he will wait until she wants to kiss him. The two began dating and at the end of Phases, Willow kisses Oz.

Also in "Phases," we discover that after a bite from his younger cousin, Oz is now a werewolf. Three days out of each month, he has to be locked up so he won't hurt anyone although on several locations, he's come close. In the episode, "The Zeppo," Oz ate Jack, one of Sunnydale's walking dead.

Oz and Willow got very close over the time they dated, but unfortunately, Willow's love for her best friend Xander got the better of her and she secretly started seeing Xander. In the episode, "Lovers Walk" Oz and Cordelia walked in on the two kissing, thus destroying their relationships. Willow and Oz however, were able to rebuild from the beginning and have since been working on a solid, truthful relationship. They took their relationship to the next level when the threat of Sunnydale's destruction led them to "panic." They were also late for their own graduation ceremony because they were in the back of Oz's van.