That's a tough one, but maybe World is Mine. または possibly Trick and Treat. Black Rock Shooter, maybe, but I also like all of the songs in the 'Evil' series. Dang, this is a toughie. I'd have to go with the 'Evil' series because those songs never get old, in my opinion.
Alice human sacrifice But for every individual character... Miku- 愛 is War Rin- Kokoro Len- Servant of Evil Luka- Palette Gumi- Lie and Diamond Gakupo- Dancing Samurai Kaito- Lord of Darkness Meiko- My true self
either unhappy refrain によって Hatsune Miku because it relates to my self または Worlds end dance hall によって Hatsune Miku and Megurine Luka because i 愛 the rythm and it has a powerful meaning または Never let あなた go remix によって SeeU because it has a wonderful rythm and sounds soo emotional