I second the idea of Deku Sticks.
I also want Ice, Fire, and Light arrows, a hammer (Doesn't have to be Megaton but it could be), and the boomerang (I don't like the design of the Beetle to be honest).
I want Dark Link to be a miniboss who doesn't exactly mirror your actions but has all of the items that you "should" have at the point you fight him at. So, say I pull out the bow then he could block the arrow I shoot and take a swing at me, or he could use his bow when I'm at long range. That would add some diversity.