This is quite the tough question due to all of the amazing creatures that there are to choose from throughout the Zelda universe.... hmm.... I would have to say that the winged Mothulas from Wind Waker take the cake for me. Their wonderfully creative design, lively animations, and contrasting...
Well the pedestal where you place the Master Sword is in fact in the middle of Faron Woods, the main location in which the sword is found in later games. I believe that the Hyrule in Oot was built around this resting place. That is the only outcome I can see being plausible.
I dont really blame them on some ends for not making it like the other instruments in the series, mainly because of the motion plus controls difficulty in playing, and it.... well its a harp!