Returning Masks in the Game

All Nighter's Mask
Obtaining: Can be bought at the Curiosity Shop in West Clock Town after 10pm

Bremen Mask
Obtaining: Obtained through storyline, found lying outside Clock Town

Description: While wearing this mask, small animals may follow you

Bunny Hood
Obtaining: Round up the ten Golden Bunnies in Southern Ranch

Description: A mask that speeds up your body, making you faster

Deku Mask
Obtaining: Obtain from the Deku King in the Swamp

Description: A Mask that turns link into Deku Link. He can now shoot bubbles, skip across water and do spin attack, his instrument is pipes

Goron Mask
Obtaining: Get from Goron Elder upon entering Goron Village

Description:

Kamaro Mask
Obtaining: Talk to Kamaro in Termina Field at night

Description

Keaton Mask
Obtaining: Obtained through the Anju Missions (DLC)

Description: Can be used to summon Keaton

Mask of Truth
Obtaining: Talk to the 100 Gossip Stones around the land of Termina

Description: A mask that will let you know the truth about what animals are thinking