Talk:Ken Kaneki/@comment-29827930-20160902111938/@comment-76.5.82.216-20160903190029

We have no real answers regarding Kaneki's kagune arm. Before the timeskip, he had two perfectly normal arms. After the timeskip, his arm had changed to a kagune-like limb that he's able to manipulate at will. It's not like Amon's, who cannot regrow certain fingers (and who is seen as defective), nor is it like his kagune-legs, which were a split decision he made when the going got rough. You can postulate and speculate about it all day long, but in the end, there's not enough info to form a solid theory.

Imo, the best possibility is that kagune are akin to parastic organisms, and Kaneki's kagune has spread from his kakuhou to his arm. That would also explain Kuro's abnormality (she didn't incorporate Shiro herself into her, she incorporated Shiro's kagune), as well as Amon's defective arm (the kagune spread too rapidly through Amon and enveloped his arm).