Keaton Mask

The Keaton Mask is an item found in both Ocarina of Time and Majora's Mask. The mask's appearance may be a reference to Pikachu, as well as Keatons looking reminiscent of a Kitsune.

Ocarina of Time
In Ocarina of Time, the Keaton Mask is the first mask Link obtains in the Happy Mask Shop sidequest. It can be sold to the guard standing outside of the gate to Death Mountain in Kakariko Village for 15 Rupees, however, Link only needs to repay the Happy Mask Salesman 10 Rupees.

Majora's Mask
In Majora's Mask, the mask can be used to summon a Keaton. Link must stand in any ring of moving bushes, cut one of the bushes down, then stand there until a Keaton appears. He will ask Link five questions, each with three choices. If he gets them all correct, he will be awarded with a Piece of Heart. The Keaton Mask Link receives in Majora's Mask was given to Kafei when he was little by the Man from the Curiosity Shop.

Kafei wears the mask to keep his identity hidden from Termina. The Keaton Mask is obtained by going to Curiosity Shop Guy in Kafei's place, after delivering the Letter to Kafei. It is well hidden, requiring Link to go to Kafei's hideout at 1:00 in the afternoon on the Final Day. For more information, see the Reuniting Kafei and Anju article.

The Wind Waker
In The Wind Waker, the Keaton's Mask appears in a cameo among Carlov's sculptures in the Nintendo Gallery. It can be seen with along with the Bunny Hood, Goron Mask, and the All-Night Mask behind the counter hanging on the wall.

Trivia

 * The Keaton Mask shows resemblance to the face of Con from the Kirby series.
 * This mask is also an unconfirmed easter egg as it is one of the five masks that resembles a character from the Star Fox Series (in this case being Fox).