Grumpy was my favorite of the dwarves based on the ones of the same names from the Snow White stories. The rest of them were forgettable.
Grumpy is obviously the leader of the dwarves, and like the classic stories they mainly help and ally with Snow White.
And he is one of her most loyal vassals.
In the cursed town of Storybrooke, he becomes Leroy, a very grumpy and sour blue-collar worker who sometimes lands in trouble.
Ironically he was “born” as Dreamy, a very optimistic dwarf. I think he turned sour after his romance with Nova the fairy went south.
But their affections for each other carried over to the new world. Nova is Astrid in Storybrooke, a nun who makes a horrid mistake that Leroy heroically reverses for her.
After the curse is broken, his importance dwindles but he still stays around.