Sakon

From Zelda Wiki.org

In Ocarina of Time, his parallel character is very minor. He can be seen running around the Hyrule Castle Market looking very suspicious. In the ending credits he can be seen dancing around, joining in with the party.

In Majora's Mask, Sakon is a nasty and cunning thief. He is a very sly and suspicious character, although he always tries to act cool. His hideout, Sakon's Hideout, is situated in Ikana Canyon with a huge boulder placed in front of it and can only by opened by Sakon himself. He can be seen in North Clock Town in the first night trying to steal a Bomb Bag from the old lady of the Bomb Shop in West Clock Town. You can retrieve the bag by striking Sakon with your sword, which will guarantee the Blast Mask for you from the Old Lady, or murder him by detonating the bag with an arrow or the Hookshot or another bomb, although you won't be able to retrieve the Blast Mask this way. He steals the Sun Mask from Kafei and is later followed by him into his hideout to recover the mask and keep the promise he made to Anju. Sakon can also be seen in the lower place in Ikana Canyon running in circles. There he will try to steal your sword but thanks to Tatl he ends up giving you some useful tips. It is unknown where he is after Majora's Mask is defeated.