Angel (season 1)
At the end of the third season of "Buffy", the 242-year-old, re-ensouled vampire Angel left Sunnydale to give teenage Slayer Buffy Summers the chance to live a normal life. Angel is now living in the big city of Los Angeles. With Buffy gone Angel is now completely cut off from society, every day getting closer and closer to giving in to his vampiric hunger. It's not until he befriends the half demon and fellow Irishman Doyle, who is sent visions of people in trouble by The Powers That Be, and fellow Sunnydale resident Cordelia Chase, who grounds Angel's life in the humanity around him, that he truly begins to take charge of his life and seek atonement for his past sins. He sets up his own detective agency, Angel Investigations and begins to "help the helpless".
List of minor Angel characters
In the fifth season of "Angel", Andrew Wells says Buffy has been dating the Immortal. In Joss Whedon's canonical comic series of Buffy's eighth season, it is revealed it is not really Buffy who is dating the Immortal, but one of her two decoys pretending to be her so she can stay hidden from evil forces. Andrew was the one who decided the Buffy decoy should date the Immortal, because he "thought it would be funny." Both Angel and Spike still view the Immortal as one of their greatest enemies, resenting him apparently again being involved with another woman in their lives. Buffy herself doesn't know why Andrew thought it would be funny.