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The slim and long "cat" that Martha controls. He is completely silent, as he makes zero sound when he moves. His bells do not jingle, his clothes don't make sound, and he levitates/hovers instead of actually moving. He moves like a puppet on strings, however, he is his own master.
-Both John and Grug seek to protect Martha and carry out her orders. If she wants someone dead, they won't stop until the task is done or interrupted.