Manga wise I like Chiho Saito, the writer of Peach Girl(she actually slipped my mind!) and Keiko Suenobu for story and art.
normal book wise I like Vladimir Nabokov, Oscar Wilde, Anthony Burgess, Hunster S. Thompson and Mick Rock's books.
All have a quirkyness, the most adult being Lolita as one of my favorite novels. The sexuality while it is disturbing, is also intriguing. Sadly, the same sexual activity in any other forms is very taboo. Making Lolita one of a kind. Oddly, people accept the novel, even though it is purely sex based lust after someone under the age of 14, and is solely about a pedophile. I guess it's a little too disturbing for some. It freaked me out at first, so I understand.