I always thought it would be interesting to have Link carry around a poe flame in a lantern as a companion. A companion whose goal perhaps is to be released by Link - or at the very least is not particularly concerned with petty mortal details such as Link's continued existence. It knows a great deal about monsters and whatnot, but sometimes it decides to be cryptic or misleading in order to trick and confuse Link. I think it would be interesting to play with an unreliable guide for once, as opposed to a guide who apparently has nothing better to do than help you out at all times, unconditionally.
If anyone has played American McGee's Alice, I would like a guide similar to the Cheshire Cat. Sometimes, the cat would give good advice. Other times, it would troll you or say something completely irrelevant.
But that's unlikely considering that poes are evil, and the point of a guide is to make the game easier and not harder. I would still like to see this, though - for what it's worth.