Yakkey

From the Super Mario Wiki

Yakkey is a talking key that is needed to open the door to the Windy Mill. The key is locked away in a treasure chest in Tubba Blubba's bedroom. During the events of Paper Mario, the hero Mario had to sneak past Tubba Blubba, who was sound asleep in his bed, and open the treasure chest containing Yakkey. Unfortunately for Mario, Yakkey was a talking key who was completely loyal to his master Tubba Blubba. As a result, Yakkey screamed as loud as he could, causing the "invincible" Tubba Blubba to wake up. Mario ran away with the key, and Tubba Blubba chased the plumber through his fortress. Eventually, Mario reached the windmill that held Tubba Blubba's weakness, his heart. When the game came to a close, Yakkey desired another master to guard his secret in the Windmill.

[edit] Trivia

• When Mario is opening Windy Mill, the game refers to Yakkey as "Mystical Key".

Keys
Black Key | Blue Key | Card Key | Castle Bleck Key | Elevator Key | Fortress Key | House Key | Key | Odd Key | Palace Key | Pedestal Key | Random House Key | Red Key | Ruins Key | Shop Key | Skeleton Key | Station Key | Steeple Key | Storage Key | Storeroom Key | Warehouse Key | Yakkey