Once I had an idea of what to do for my comic, I started researching the concept of death in mythology and folklore, as well as spirits, gods and other magical beings associated with it. I became most interested in 'wights', which in recent years have come to be seen as undead or wraith-like beings in the fantasy genre. However, in Norse mythology, the landvaettir or 'land wights' sometimes refers to guardian spirits of sacred places. I combined both these versions to create the wights of my story, the warped dead spirits that now guard Purgatory.
The Ankou of Breton/Cornish mythology would form the basis of my character the Black Owl. The Ankou was a grim reaper that was a dead spirit himself, who wore a large hat to hide his face and whose cry was called 'Labous an Ankou' (the Death Bird).