I can't really see any major characters that will actually die if its anyone it might be old man Yami cause who else can stand up to Aizen at this fight before Ichigo will have to do it? Because so far none of the important shinigami have ever died yet and I don't think any will die but probably get seriously injured like lose an arm or something (which Inoue can bring back any dead people [or missing limbs] anyways

)
Really Inoue cancels out all death on the side of her choosing

thats kinda ridiculous if you ask me... She should lose that power or like go into a coma/die

(sorry to you Orhime lovers)