I haven't been able to find much in the way of specifics (quite possibly because the specifics haven't been released yet)
http://en.wikipedia.org/wiki/List_of...pers_in_Bleach
This has a fair amount of info, mostly about the characters themselves, but there is enough info to make at least a couple 'starter feats' off of.

nothing off the top of my head on other spells...well....*hmmm*
Hitsugaya probably has a nasty variation of cone of cold...or else that 'Freeze' spell.
Ichimaru has something like bloodwind, that lets him make attacks at a range.
Byakuya has a base of vortex of teeth, and some variations thereof for the other things he can do with his zanpaktou

I'd love to help build this class, as I enjoy both the show and designing stuff like this....so...yeah.