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Kristen Joy Schaal (born January 24, 1978) is an American actress. Known for her distinctive child-like voice, she has voice roles as Louise Belcher on Bob's Burgers and Mabel Pines on Gravity Falls. She also played Mel on Flight of the Conchords, The Guide on What We Do in the Shadows, Hurshe Heartshe on The Heart, She Holler, and Carol Pilbasian on The Last Man on Earth. Wikipedia