A best friend turned to nemesis is a common occurrence in story telling. The evolution of a main character’s archenemy is something that doesn’t happen instantaneously. It has been brewing through time, and is usually preceded by an unfortunate event that most likely involves directly or indirectly, the other best friend (usually a main character). When writing the deterioration of this relationship, the history/background of the two characters is important, but mostly, the actual interaction between them is. Whether this unraveling occurs due to a supernatural or perfectly natural event, the relationship and interaction between the two (or more) characters cannot remain the same. Writing has to reflect that.
In The Dinorah Chronicles, Hael, an embodiment of evil via supernatural origins, is Dinorah Sandbeck’s nemesis. When a supernatural event is the cause for the “turning of the coat,” the vilifying of the other character seems a bit less complex and left to the imagination of the writer. When natural/human issues are involved, the vilifying becomes a bit more humanized, thus exploring the psyche of both characters, hopefully without risking to bore the reader. I think that too much detail/drama that is prolonged in the natural deterioration of the relationship between both characters becomes boring; at least for me as a reader, it is. Whether natural or supernatural, this vilification process has to evolve over time, have a history, and a clear motive throughout the story, which is developed and supported mostly via dialog and prose, sometimes even description, and through other secondary characters.
Throughout a series, the archenemy can remain the same, be a different character(s), or even be reborn into a different physical vessel that embodies the original evil essence. Sometimes, this nemesis can be a duality, a part of the main character, one that is awakened through a devastating psychological, physical event, or a combination, that leaves a permanent mark in the character’s persona. The important aspect on this friend/nemesis evolution is that there is a thread that the reader can easily follow throughout the story or series.
I hope you enjoyed this post. Feel free to add your take on this topic.