Cremia, Medli and Saria (sort of; I'll try to explain)
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Cremia
Why would I have a crush on Cremia? Well, it all started when I started to read Legend of Zelda fan fiction. See, a good deal of fanfics regarding LoZ really are LinkxZelda oriented, a fact that bugs me so much because the Zelda of Ocarina of Time is so incredibly dull and boring - what would any hero want with her? Getting out of Hyrule, I started to read fanfics about Holodrum and more recently, Termina. Having played through Oracle of Seasons/Ages as well as Majora's Mask, I can confirm that the NPCs of both games have at least the basis of a personality with which to fuel any fic writer's mind. So, I was sorta interested in reading about Nayru (Oracle) because she is, well, cute in a way. But I found there are not really many LinkxNayru fanfics about. So I turned my sights to MM. In fan fiction, most of the LinkxCremia stuff I've seen is some weird Adult LinkxCremia, which isn't exactly bad, but I really much prefer the younger, more innocent 'Mother-Son' found ingame (specifically, the scene where Cremia gives Link a hug). Then I started going through Majora's Mask's sidequests, and spotted that scene, and I've had a crush on Cremia ever since. I so wish I could get a hug from her /jealousofLink
Medli
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I played Wind Waker around the time it first released, and oddly enough I found Medli to be this word that I didn't know at the time. Something about her made me prefer her over Makar, and over a good deal of the TWW cast at that. Slowly but surely I outgrew that crush, but it existed for a while. Maybe it was her beak, I dunno.
Saria
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A similar story as regards Cremia takes place, but before and actually after that, I noticed that ingame of Ocarina of Time, Saria is pretty much the only one who genuinely cares about Link throughout the entire game. She, above all other seen people/entities, was the only one who really wanted to stay with Link, rather than simply using him to further some mission/goal. Look at Navi, she only stood with Link because the Great Deku Tree said so! Zelda ditched Link after he had defeated Ganon! Malon is more interested in her farmlife than Link (though there could be some implied romance that I'm just not accepting...)! Oh, and I also sorta pseudo-retcon the 'official' stuff behind Saria, in fanfics that I like to imagine, she is really a Hylian just like Link so as to stave off those "Adult LinkxSaria is wrong" people. So yeah, I have this extensive crush over Saria that I won't get rid of, because she is sooooo cute :3
In all honesty, I WANT to have a crush on TP Zelda, but she has no personality :/