Azazyel
one important question. Will his blood and tissues stay there after the fight to be collected by the villains or will it turn into reiatsu after a while. and if its collected by the light will there be many hollows in the future??. plus why hasn't he asked to learn magic. I mean doctor fate says his soul is more powerfull than 100 million souls. a walking nuclear bomb. so instead of shinigami kido he can learn magic.