[Natsuki Hyuga]

Spoiler:

That decapitated head is not her though lol. The one I was talking about is the part where there is a character that talks to Torso, and saying that there is an order from "Tree" (This is referring to Aogiri Tree). There is a rampant speculation that this character (female) is Hinami.

Saying that though, from this chapter we can pretty much guess that Torso is Aogiri-related, and is a taxi cab driver. That last part totally is not Tsukiyama