Perky and 15 years-old, Misty Brown is a cat burglar who occasionally ran afoul with Rally. However, she often is portrayed as the archetypical "damsel-in-distress" when Goldie catches sight of her. Later on in the manga, she ends up working for Rally and May.
Besides her burglar skills, Misty is also an excellent knife fighter. She also has a crush on Rally, but has also expressed interest in Bean. However, at the end of Gunsmith Cats BURST, Misty left Chicago with a gradually-reforming Goldie - but not before giving Rally a very passionate kiss goodbye.