Young Link completely different Moveset, maybe based off the Mask
Pichu as Plusle+Minun. That way its actually relevant
Of course Plusle and Minun would crash the 3DS like the Ice Climbers did. Young Link should definitely be based off of the Masks in Majora's Mask. He could turn into each of the 3 characters as skins which lead to different movesets. Also, the fierce Deity Link would be his smash. It's amazing that smash has so much potential even though it is already showing so much. Roy could easily work if they look back at the Binding Blade and fork out the attacks.