User blog comment:Xilinoc/Ch. 554 - Desperate Lights/@comment-4509522-20131023204226/@comment-11051098-20131027090736

Only his eye, as can be seen.

And I think there's an "organic" look to some of BG9's body parts, so to speak. In the panels where he reveals the missiles in his chest and arms, and when he lose the stolen Bankai, I think the shape of his abdomen, upper arms and thighs look muscular and "human".

And his surprise/shock by events like getting his minigun destroyed and losing the stolen Bankai, seem to go beyond how a robot would react.

He does appear to be a cyborg of some kind. Perhaps he was designed that way, or rebuilt from a dead Quincy, but I don't think BG9 is 100 % robotic.