Ginga Eiyuu Densetsu, Kemono no Souja Erin, Yokoyama Mitsuteru Sangokushi, Souten Kouro, Tengen Toppa Gurren Lagann, Panty & Stocking with Garterbelt and Baccano!
I'm a great fan of Hiroyuki Imaishi.
Also Katsuhiro Otomo (Akira, Steamboy, Robot Carnival...) and Satoshi Kon (Paranoia Agent, Millenium Actress, Tokyo Godfathers...)
I can't classify them, they belong to different genres