Ukiki

Ukkiki is a monkey in Super Mario 64 that will show off for you. If you pick him up he'll steal Mario's hat.

Grap him to get it back. If you lose the hat in the level then die, go back to Ukkiki, he'll be wearing Mario's hat.

He only appears in Tall-Tall Mountain.

In the second mission, you must catch him, and he will jump on a cage with a star for you. Just jump directly down with him and you will access the star.

Ukkiki also makes cameo appearances in other Mario titles, including Mario Party 4, in which the monkey-like creature will toss a banana. This banana, upon being slipped on, will determine a character's path around the game board.