Board Thread:General Discussion/@comment-1535822-20130227140506/@comment-5551986-20130227141545

It would seem his is half shinigami/quincy at his core. However the fullbring powers stem from his mother being attacked by hollow when she was pregnant with him (Fullbring is not a race, but a power) Urahara also gave him shinigami powers in such a way it also allowed him to use a hollow mask. His classification i suppose would be a shinigami/quincy hybrid who had hollow powers.