Ellen Hopkins: Burned, Crank, Impulse, Glass, and Identical. Damn good writer.
very gritty, beautifully written books about some of the darkest teen topics. My personal favorite was Impulse because I relate to the characters very well.
My favorite writer: Francesca Lia Block: Weetzie Bat, Baby Bebop, Missing Angel Juan, Witch Baby, The Hanged Man, and Blood Kisses. She has a very poetic, cool, almost jazzy writing style almost always taking place in LA. She makes even the dark parts of it very mystical and beautiful.
Herman Hesse: Damian, Siddartha. One of the best writers in my eyes of the 20th century. He was honest and do intriguingly so down to earth it was fantastic.