Griphook
A goblin who works at Gringotts Wizarding Bank in Diagon Alley, taking customers by cart through the tunnels far beneath London to the vaults where wizarding families keep their gold.
Griphook takes Harry and Hagrid down on Harry's first visit, whistling up a cart that rattles along without his steering, and he answers Hagrid's plea to slow down with one speed only. At a vault door with no keyhole he melts the door away with a stroke of one long finger, and he warns that anyone but a Gringotts goblin who tries it gets pulled inside and trapped, adding with a rather nasty grin that someone checks about once every ten years.
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