Guardtale is an Undertale AU where the roles of Flowey, Toriel, Sans, Papyrus, Monster Kid, Undyne, Alphys, Mettaton and Asgore are the Five Nights at Freddy's night guards. The other roles are played by the animatronics.
- Freddy is the main protagonist.
- William is a soulless flower.
- Scott is the caretaker of the RUINs.
- Mike is the laidback best friend and ex-boyfriend of Jeremy.
- Jeremy just wants to capture an animatronic so he can join the Royal Guard.
- Eggs pursues the protagonist throughout Waterfall.
- Fritz is the Royal Scientist
- Alex is the star of the Underground.
- Johnny is the King of the Underground.