Board Thread:Questions and Answers/@comment-34681548-20180213052442

Why do ceros change color? i know most of them are red, but there are a few exceptions, such as Wonderweiss, Ulquiorra, and Halibel. Is there a reason fort he color change or is it just because?Can anyone actually answer this, with some evidence? Is it power level, gender,personality, zanpakuto, or eye color? 