Board Thread:Questions and Answers/@comment-24499616-20140208162134/@comment-6007020-20140209000224

Countering the arguement about being undeniably evil, you've got to remember he's still a Hollow. Sentient or not, his soul has been warped by hunger, and the despair of realizing that he's a monster. As long as he didn't commit crimes during his human life, he doesn't go to Hell. As for Aaroniero and Szayelaporro going to hell, for all we know, they did commit crimes when they were alive.

Also, one's hollow form can differ drastically from one's human appearance. Human Ulquiorra might look 100% different from Arrancar Ulquiorra.