Shadow Walkers are a strange breed that possess the ability to slip between the planes of reality, becoming immaterial. This allows them to hide in the shadows, either hunting from the concealment of near invisibility or evading enemies. Though they become corporeal to mate or to eat, they spend most of the rest of their lives walking in the shadows. Shadow Walkers are wary creatures, though on dark autumn evenings when the leaves fall to swirl in the chill, rain damp air, they may be seen drifting out from the shadows.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Philomortis is the mastermind (if one would call him that) behind a series put on by the Blusang Broadcasting Coalition about a wizard who is cursed to be unable to leave his tower. He has discovered (in the first episode) that in order to break the curse, he needs a very specific type of toad, distinctive in that the males of the species carry strings of eggs on their hindlegs until they hatch. Most episodes start with the protagonist attempting to magically conjure such a toad, only to summon something else instead. Phillomortis likes to encourage creativity, so he reads scripts written by fans or junior members of the staff, and if he likes them enough, will buy the script and put on the performance, to be watched through magic mirrors and scrying pools throughout Valkemare. There are plenty of fans who want to participate, so he has his talons full reading all the scripts he receives and deciding what to make into an official episode of "Call the Midwife Toad".