Since it's a 'cinema purgatorio graphic novel', it might tell stories of the in - between state of cinema. It could be about the movies that are not quite good enough for the heavens of mainstream success, but not bad enough for the hell of being completely forgotten. The graphic novel format would allow for unique visual interpretations of this purgatorial cinematic space. It might show how different films, characters, and the entire film - making process are in this liminal state, with a blend of drama, mystery, and perhaps a touch of the supernatural to make it an engaging read.
I don't know the specific main characters in 'cinema purgatorio graphic novel' as I haven't read it. But they could be filmmakers, actors, or even movie characters themselves who are trapped in this cinematic purgatory.
Well, it varies depending on different manga series. For example, in shonen manga, characters like Goku from Dragon Ball and Ichigo from Bleach are highly favored. Their strength, determination, and growth throughout the story make them beloved by many.
A major feature of a big comic collection is its diversity. You could find comics from different eras, publishers, and artists. Also, it might have complete series or limited editions that make it unique.