I don't feel up for a whole write-up on Neil Gaiman's graphic novel Sandman. I only read Vol. 1, and GN and RA are still a little shaky for me, but I wanted to record a few notes in case I come upon anything in the future that may be a readalike.
The first volume is definitely strongly influenced by horror. In fact, I feel like this series is often suggested as a good intro to GN that many adults will like, but I don't think I was prepared for how violent and scary it is. I hear the later volumes are less so.
Other descriptive adjectives: fantasy, a bit of humor, the justice league makes a very brief appearance, fantastic, absurd, unpredictable and at times unclear (though explanations follow).
Dr. Doom, the bad guy and source of most of the horror of the book, describes the book well when he's talking about dreams: "People think dreams aren't real because they aren't made of matter, of particles. Dreams are real. But they are made of viewpoints, of images, of memories and puns and lost hopes..."