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Merfle is a supporting character in Wario Land: Shake It! In the game's introduction sequence, after the Shake King kidnaps Queen Merelda and her people, the Merfles, the green Merfle manages to escape and, in search of someone to help them, finds Wario who accepts it in exchange for the Shake Dimension's greatest treasure. He also requests the help of Captain Syrup who, unbeknownst to Wario, wanted the Bottomless Coin Sack for herself as a "consultation fee" from the start.
During the ending, after Wario has saved the Merfles and their queen, he happily shakes the Bottomless Coin Sack before it is taken by Captain Syrup, who explains to have held up her part of the bargain. Merfle then explains to Wario what happened, before being chased by him.