which ones has young link been in? isn't it Ocarina of Time (and Majora Mask, nearly forgot that since I didn't play it)
mind that it is YOUNG Link, not the older one AFTER he took out the master sword.
Young Link has Boomerang - Might hurt, slingshot won't do much, deku nuts can stun, bombs, Bombchu (remember these), Din's Fire, Farore's Wind and Nayru's Love (and not to forget the Deku Stick which is pretty much as powerful as the master sword 0.o) Kokiri shield will set alight, he can't hold the hylian shield cause it too heavy so it more of a shell. He'll eventually run out of bombs, bombchu, magic power, deku nuts, slingshot ammo,.
Roy - now I've not played ANY fire emblem games so i'll have to base it on his SSBM attributes of having "t3h ph1r3" has body armour unlike YL's tunic and a longer sword.
so from what I can deduct, Roy might win