Not a 3D game! 

And It's not in the main series.

That depends...

I thought OOT 3D Link looked great!

Hard question.

They all have something good and bad. Wind Waker Link isn't exactly pretty, but he fits with the style of the game. Something else wouldn't. Ocarina of Time Link, especially Adult Link, wasn't a looker either. Not necessarily because of the tech, but because he just has a weird face and big hair. However, the improvements to the same Link in Majora's Mask made it a lot better already, and with OoT3D they made the character look like he was always supposed to. I think both Twilight Princess and Skyward Sword Links are handsome enough (for a dude ) and I'm hesitant to say anything about the new Link because we barely saw anything good yet.

I think I'll still go with Toon Link, because he's the least good looking if I ignore the style of the rest of the game.

I'm gonna have to go with Toon Link.

Link's design from Twilight Princess was pretty lackluster in my opinion!

I really dislike this artwork of Link.

It makes it even worse, when they replaced the far superior version...

I'd have to say Young Link. To me, he was always a monster-looking boy until he grew up. And the whole Majora's Mask experience involves using him the whole game? Creepy. No wonder he never got a fairy until Navi arrived.

...Toon Link gets hate? How can you hate something THAT CUTE? Oh well, maybe it's just me.

yeah.  The game looks fantastic the character design with its monkey proportions (long arms short legs) does not.  The facial expression is great but the overall character desgin totally not.

I picked Twilight Princess as well. The werewolf transformation was stupid IMO, worst thing brought to a Legend Of Zelda game (again IMO).