User blog comment:Xilinoc/Ch. 576 - THE KILLERS HIGH 2/@comment-9096222-20140409153521/@comment-11051098-20140409225948

The question is whether Guenael was a real Sternritter since he was created by another Sternritter's imagination. He was a physical being, he was just not created biologically. But he was still real enough to take damage, bleed, even touch other "organic" beings like Shinigami.

This is another one of the questions only Kubo can answer.