Malon

Or Cremia and Romani if we're talking Majora's Mask rather than Ocarina of Time... I especially prefer their appearance on the former, since their relationship with Link is more dynamic and intuitive, while Malon never seems to do anything beyond teaching you Epona's Song.

But what I like the most of her as Malon is that she's among the few characters that really grows up, together with Link, Zelda, and Ruto. Maybe other characters too, but it's not as evident as them. Maybe if we compare the older Friendsies+10 with their younger counterparts, they might appear as these two, especially the youngest ones...

Judging for their size difference, I bet they're around 10 years apart as Romani and Cremia, but not less than 7... And as red-haired girls, I HAD to add freckles to them just like Aida. And cut off the sleeves on the younger one's dress