Beware that there may be some spoilers below
First the main protagonist:
Yeah, that's Link if you hadn't recognized him
And his girfriend. I don't remember he had had any in the past, I suppose he's growing up
The princess Zelda:
And here is my favorite character in the Zelda series: Midna
Don't you find she looks like a cute little imp? Links meets her quickly at the beginning of the game. At first she coerces Link into quests, but later in the game she actually asks him to go on instead, as Link progressively earns her respect.
For the most part of the game, the main antagonist is Zant:
Zant without his mask:
Until he reveals that he obeys his master Ganondorf:
Ganondorf in his "piggy" form:
He's not revealed until late in the game, because there are still somewhere people who don't know that he always is the main antagonist (except on portable consoles). Hey, I had told you there could be spoilers
One of the guardian spirits, Ordona:
Among the minor characters there are a few interesting ones, like the puppet master:
An imp who lives in the lost woods and shows the way to Link twice during the game, not without playing games with him
And here is Jovani:
Jovani was a greedy man until he settled a deal with a spirit to be rich. The spirit cursed him and he became a treasure himself, even his cat. A distant variant of Midas if you want my opinion
Although paralyzed, he asks Link to free his soul by hunting poes.
Here are a few random places.
The Temple of Time:
Hyrule castle:
The Twilight Mirror:
Which leads to the Twilight Palace:
A few more images of Midna:
She is perplex after finding about Zant's magic, which isn't of their kind.
And Midna after the curse that was cast on her by Zant is lifted:
Midna is leaving for the Twilight Realm, maybe forever.
Link showing off the Master Sword, in the ruins of the Temple of Time:
The same Master Sword after it has been enhanced by the Twilight Sols:
Link and Ganondorf showing off on their respective horses:
But no, they aren't actually facing each other. Link's image was taken toward the beginning of the game after an epic battle which spanned several areas. Ganondorf's was taken between 2 of the battles between him and Link at the end of the game.
Link and Ganondorf dueling to the death
Ganondorf is a tough swordman, as you can see with the depleted hearts at the top left of the image
This incarnation of Ganondorf is among my favorite bosses 
That's not to say I don't like the Wind Waker though 
