Janina Zione Gavankar (born November 29, 1980) is an American actress and musician. Gavankar is trained as a pianist, vocalist, and orchestral percussionist. She majored in Theatre Performance at the University of Illinois at Chicago. Gavankar's roles include a police officer on The Gates; Ms. Dewey, the personification of a Microsoft branded search engine who commented on the user's searches; Shiva, the namesake of the sought-after trophy on The League; shapeshifter Luna Garza on HBO's True Blood; McKenna Hall on The CW's Arrow; and Meredith Bose on NBC's The Mysteries of Laura. She also played Diana Thomas on Fox's supernatural drama Sleepy Hollow.