Oh gods, there are so many... Let's start with anime. Fullmetal Alchemist, Trigun, D.N.Angel, Descendents of Darkness, Trinity Blood, Yu Yu Hakusho, Kuroshitsuji, Tsubasa Reservoir Chronicle, Fruits Basket, Innocent Venus, The Wallflower, Last Exile, Nabari no Ou, xxxHolic, Blue Submarine No.6, Chrono Crusade, Air, Princess Nine, Yume-iro Patissiere, Hellsing, Blood+, Junjou Romantica, Zombie Loan, Hakushaku to Yousei, Pandora Hearts, 07-Ghost, the Miyazaki movies, and quite a few more than that. As for Manga, 07-Ghost, Fruits Basket, Junjou Romantica, Vampire Game, The Gentleman's Alliance, Vampire Knight, Kieli, Eerie Queerie, Legal Drug, Vassalord, Selfish Love, Yellow, Il Gatto Sul G, Scandalous Seiryo University, Innocent Bird, Vampire Doll, Model, Maid Sama!, Living For Tomorrow, Zombie-Loan, The Dark-Hunters, Bloody Kiss, Happy Cafe, Pandora Hearts, R.O.D, Black Butler, and many others too inappropriate to mention. I'm obsessive; that's all there is to it.