You'd need a longer list to really get a diverse casting, Zelda has a lot of characters, and the few consistently present ones will often take top billing on lists.
I'm going to be a cool guy and not list anyone who possesses a piece of the triforce, meaning no Link, Zelda, or Ganon.
Fi, Saria, Medli, Malon, King Daphnes Nohansen Hyrule, Skull Kid, Darmani, to name a few. Can't really pick a top five or order them.
GROOSE the only Zelda character to say "**** your legends and chosen ones! I'm gonna be a pivotal character no matter how hard the storyline tries to make me insignificant!"
And he ended up saving Zelda, putting demise on his ass and all this with his hair intact.
1. THE GROOSE MUST BE LET LOOSE!
2. Skull Kid
3. Oot/MM Link or The Hero's Shade from TP
4. Vaati
5. Kafei