What are some good anime crossover couples that can actually work?

Ichigo and KakashiWhat are some good anime crossover couples that can actually work?
There is Kurama X Kagome:


http://tn3-2.deviantart.com/fs23/300W/i/2007/353/4/d/Beautiful_people_KuramaxKagome_by_TechnoRanma.jpg





Aerith (FF) X Kakashi


http://fc03.deviantart.com/fs32/f/2008/187/a/6/Kakashi_and_Aerith__another_1_by_AkinaSaita.jpg





Hero X Usagi


http://tn3-1.deviantart.com/images3/300W/i/2004/145/b/d/usagi___heero.jpg





Kyou X Ichigo (Mew mew one)


http://fc06.deviantart.com/fs8/i/2006/162/7/0/First_Contest___EXAMPLE_2_by_Cartoon_Obsessions.jpg


(ROFL They both turn into cats)





I'll put up more later if I can find more!