Speaking of Zelda with Fire Emblem gameplay, I've actually thought how it could all work out.
There could be regular Link, using a sword and then when he gets the master sword, he could get a 2 ranged sword because he can shoot beams out of it (to stay true to the series, Link's gotta have full health). Zelda could be a mage/healer, there could be 4 swords Link but instead of giving swords, have them all Link's arsenal of weapons. Young Link could be tweaked to be a thief, Tetra can be a pirate, and you can use the Deku Scrub, the Goron, and the Zora from Majoras Mask.
My imagination ran wild for a bit when I was waiting for Awakening...