The Gatekeeper Trilogy

The Gatekeeper was a trilogy of books written by Christopher Golden and Nancy Holder based on the TV series Buffy.

Trivia in volume 1

 * Tagline: 'Evil is eternal'.
 * Buffyverse canon characters include: Buffy, Xander, Cordelia, Willow, Oz, Angel, Giles, Spike, Joyce, Devon, Sheila Rosenberg, Ira Rosenberg, Kendra, Jenny Calendar
 * Buffyverse non-canon characters include: Il Maestro (sorcerer); Micaela Tomasi (traitor Watcher); Roland (Lord of the Hunt); Springheel Jack (monster); Catherine de Medici; Richard Regnier, Jean-Marc Regnier, Antoinette Regnier (Gatekeeper allies); Giacomo Fulcanelli (sorcerer); Brother Lupo (Son of Entropy)
 * Deceased characters Jenny and Kendra are visited on the 'ghost roads'.
 * Michaela Tomasi also appears in Giles

Trivia in volume 2

 * Tagline: 'Last exit before fear'.
 * Buffyverse canon characters include: Buffy, Angel, Oz, Giles, Cordelia, Willow, Xander, Spike, Drusilla, Joyce, Sheila Rosenberg, Amy Madison
 * Buffyverse non-canon characters include: Jean-Marc Regnier, Henri Regnier, Jacques Regnier, Antoinette Regnier, Giuliana Regnier (Gatekeepers); Il Maestro (sorcerer); Belphegon (demon); Ian Williams, Micaela Tomasi (traitor Watchers); Claire Bellamy (manager of The Bronze); Brother Anthony, Brother Lupo (Sons of Entropy); Giacomo Fulcanelli (sorcerer)
 * The Bronze managers also appear in Halloween Rain and The Evil That Men Do.
 * The character Roland appears from Child of the Hunt
 * The character Kobe Sensui appears from Blooded
 * Joyce briefly moves in with Giles for protection.

Trivia in volume 3

 * Tagline: 'The final battle has begun'.
 * Buffyverse canon characters include: Buffy, Xander, Willow, Giles, Angel, Oz, Cordelia, Amy, Joyce, Ethan Rayne
 * Buffyverse non-canon characters include: Jacques Regnier, Jean-Marc Regnier, Antoinette Regnier (Gatekeeper family); Micaela Tomasi (ex-Son); Fulcanelli/Il Maestro (Sons leader); Brother Claude, Brother Lupo (Sons of Entropy); Belphegor (demon); Hadrius (Fulcanelli's teacher)