Dorohedoro (2010)

Grimy, funny and violent. Caiman is a man whose memories were erased and whose head was turned into a reptile's by a sorcerer's magic, and he roams the slum city of Hole looking for the one who did it. Q Hayashida's art is dense and filthy in the best way, packed with masks, smoke and gore, and the tone swings from gross-out comedy to real cruelty. It is less frightening than most of this list, but nothing else looks like it. Expect plenty of dismemberment. Viz's English edition is complete in 23 volumes.