Who is Pete in Animal Crossing

Pete the pelican is the mail carrier in AC. In the GameCube version, once you've covered the desk behind the front desk full of five letters, hurry out the door of the post office and look for Pete. Just then he should be going up into the sky. In City Folk sometimes he's wandering around the town. If he has a letter to give you, he'll be standing outside of your house. In Wild World, I haven't ever seen him except maybe flying in the air a few times.