Favorite Character: this might be the toughest question I've ever been asked and I can't pick just one so, Navi, Midna, Epona (come on you have to love her!), Talon, Nabooru, King Hyrule in WW, and Darunia. I honestly loved all the Sages in OoT but tried to keep my list short. I'd also like to say I love Sheik and Tetra BEFORE I found out they were Zelda. Something about Zelda is 2D to me. I'm not fond of her in any of her incarnation, though I like most of what I've seen of her in SS (though I haven't actually played it)
Favorite Boss: Queen Gohma from OoT. Though she is extremely easy and not remembered as fondly by most others. Her boss fight was iconic to me the first time. You step into a dark room, a few paces forward you're locked into this darkness and shuffling noises echo against the walls. You take a look around and are greeted by a single eye staring you down. This nearly made me wet myself back then. Plus, the first time I fought her I followed the simple pattern of slingshot sword the whole fighting making it just a bit lengthy my first time ( I thought Deku Nuts were useless until years later) but I learned you could stun her with those and then I learned the deku sticks did more damage than you're sword and this battle is the only one I ever saw myself really evolve in because I turned it from a grueling bout to taking her down before she could even make it back to the ceiling. My love is mostly nostalgia of the first time and how it set-up OoT so well but I haven't had any other boss give me a true wow factor upon stepping into their chamber.
Princess Zelda has always been my favorite character ever since I started playing Zelda. Something about her makes me like her so much. Her beauty is very amazing that it can put any man*cough*Link*cough* drool for her. She's a very special character for me.