Your helpful
fairy friend in
The Legend of Zelda: Majora's Mask. As opposed to
Navi, who always screamed "Hey!" and "Listen!" at the top of her little fairy
lungs, Tatl has a
less irritating ringing sound associated with her.
Also as opposed to Navi, Tatl isn't overly thrilled with the concept of tailing Link around as he gets himself into danger over and over again. She really doesn't have much faith in him, and it shows in the slightly more sarcastic information tips she gives. (i.e. "Hey! Over here! See, you always MISS things like this...")
Tatl has a brother, Tael. Tatl is chiefly concerned with getting back with Tael, rather than the whole issue of saving the world.