User blog comment:Xilinoc/Ch. 667 - BIGGER, LOUDER, STRONGER/@comment-5398287-20160324133928/@comment-1351982-20160324200005

Well I wouldn't be surprised if that were the case. A few characters in bleach have similarities to people who lived during World War II  I mean those would have to be pretty big coincidences. Also Ulquiorra's name is similar to the Spanish phrase, El Que Llora or "the one who cries" which would explain the sad clown face.