User blog comment:Xilinoc/Ch. 549 - The Stormbringer/@comment-6916556-20130919215544

Knowing Kubo's awful German, BG9 may stand for Bringer Gewitter 9 which is a poor way of constructing 'Stormbringer' in German. He could be a adversary to Sui Feng's wind. Or maybe something like Böse Gott 9 (Wicked God 9). I am thinking the 9 is a reference to Yhwach's affinity to 9. Like maybe he built the ultimate killing machine in 9 hours. Or with 9 Quincy sacrifices the ultimate offensive machine was born. Either way, it represents everything Yhwach isn't. It is violent,completely cold, and without expression. Maybe it was made to do the Sternritter's dirty work. I think it is definitely K the Knight. I hope BG stands for something. The 9 is definitely a thematic reference to the Kaiser Gesang.