I voted for Tingle!
Tingle made his debut in Majora's Mask, and his since become a fixture in the Zelda series as well spinning off into his own set of games. He has a unique look, unique personality, and has the ability to play uniquely based upon his giant balloons, love of rupees, koolah-limpah magic, Tingle Tuner, Tingle Bomb, etc. A final smash could include him bringing in some of his bodyguards from Rosy Rupeeland. Alternate costumes could be Knuckle, Ankle, David Jr., his human form, and a colorscheme based on Pinkle.