Buffy and Angel have a tumultuous relationship, to say the least, in Buffy the Vampire Slayer, and one major complication is their significant age gap. Another, of course, is that he is a vampire and she is a mortal — one whose entire destiny is to kill Angel's kind. Giles even remarks on the poetic tragedy of this Buffy the Vampire Slayer relationship, and indeed, it is one of the most doomed-from-the-start romances throughout the entire show.