Lightning Arrows sound a really good idea. Imagine if you get an enemy in a small amount of water thats just lying around, like there are puddles in Hyrule Field in TP, in Eldin Province, and you shot a lightning arrow at the water, and it killed the enemy(ies) in it. Also, I think for costumes, Link should have his traditional tunic(s), but with armour in them as well, Zelda's clothing in Twilight Princess is good, shes got her dress but also some gold armour on as well. Or maybe even wearing full armour, that doesnt stop you from running fast, chain mail or something.