lol...Grim would be so existentially appalled by that thing. He would demand that Hex annihilate it immediately; not quite grasping how mass manufacture works. The world is awash in these things! You'll never be rid of them! MWAHAHAH!
Truly, he has been condemned to a fate worse than death.
I figure Grim has a Dexterity score but not Agility, so he can move in the sense that he can open and close, and turn his pages...but he has no movement speed, so he can't travel over distances. And of course he can talk, and perceive the area around him, since he lacks any flaws that would prevent him from doing so.
Sound about right?