Pff, she is so adorable. Anyway, the chain! It's on her and stuff!! o:
Also, Scratch's gun holster, what looks like Rose's big green book, and an ATH manual are all in the room. There are green candy things as well as red steaks on the floor (I don't get that part).
I have never actually watched a Saw movie all the way through because horror movies bore me. But in one of them there were two guys chained to opposite ends of the room, and at the end one of them saws his foot off to escape (and LE is missing one of his legs) and the other dies. And we can only see one half of their room right now. So if the thing with them being the same person turns out to be wrong, then their relationship might just involve them not being able to be awake at the same time or something (maybe because of some elaborate puzzle/saw type of thing??), and uu is sleeping at the other end of the room.
Also, it's looking like uu might be calmasis, while UU is zazzerpan (calliope). Then they'd both have names related to Cal. Zazzerpan never lost at chess, but calmasis pulled a trick to keep going even after the king died (like the trick uu pulled on UU, who never loses at chess).