I really liked Grumpy's backstory. Without giving away too much, we find out that dwarfs are hatched, not born, and they get their names when they're given their axes to go work in the mines. Grumpy's original name was Dreamy, but after having his heart broken by his fairy love (thanks, Blue Fairy), his name changes to Grumpy. He's a faithful friend of Snow White and Prince Charming's in Storybrooke, despite being the town drunk at first, and is the de facto leader of the Seven Dwarfs in the show.
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Until next time!