The Mask of Gibberish: Automatically translates all of the user's speech into gibberish.
The Mask of Insta-Death: Immediately kills the user upon activation.
The Mask of Slow Death: Makes the user die a slow and painful death upon activation.
The Mask of Nothingness: Does nothing
The Mask of Inaudibility: Makes the user and everything around them inaudible.
The Mask of Audibility: Contrary to what you'd think it'd do, it makes the user constantly plug Audible
The Mask of Money: Allows the user to summon an infinite amount of money in the form of dollars and coins. Would be pretty worthless in the BIONICLE world, considering they use a different monetary system.
The Mask of Edginess: Makes the user extremely edgy
The Mask of Inedibility: Automatically makes everything for the user inedible. Also allows you to make things inedible for other people.
The Mask of G2: gives you a short lifespan