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.

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