Eeyore

"Not now. Lot of thinkin' to do."

 is a character released with, and is a part of the Winnie the Pooh character collection.

About
 is a pessimistic and gloomy old donkey that first appeared in Disney's 1966 theatrical short Winnie the Pooh and the Honey Tree.

is hardly ever happy, and even when he is, he's still sardonic and a bit cynical. Ironically, he actually seems to enjoy being gloomy to an extent and sees it as the essence of his very being. Nevertheless, he seems genuinely appreciative of the effort his friends put forth to cheer him up and is still a good friend.