Incidentally, something that I thought of today:

The reason I insisted on properties that started in the medium for this list came when I considered a comparison/contrast with video game based films. I do not anticipate that someone would call a film a "video game movie" or a protagonist a "video game character" (except as a hyperbolic insult) unless the film actually adapted a property which started in video games, although plenty of properties which started outside of video games have had video game adaptations.