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I have always been a fan of the Black Lagoon series. By this point in the series, the morbid stuff is really toned down. I was a sensitive child and was creeped out by some of the illustrations and things that happened in the earlier books, so I like the direction the books have headed.
There are still violent things that happen (kids being hung up by their thumbs), but they are toned down by silliness (having thumbs long enough to hitchhike to Mars).
Silly illustrations and a fun story. I still enjoy reading these books as a adult.