oh gosh... There are so many! I love Valoo, but Lanayru (Skyward Sword) has a special place in my heart for some reason. Maybe because she (I always thought of Lanaru as a she) is so suspicious of Link, unlike all the other dragons, and SPOILERS actually tried to do something about the monsters instead of waiting around for Link to save the day.
My mistake, Faron not Lanayru. oops.