Brianne Siddall (born August 25, 1963 in Encino, California), also known under her stage names of Jetta E. Bumpy, Ian Hawk, Murray Blue, Jetta Bird, and Brianne Brozey, is an American voice actress. She is known for voicing Tommy Himi, Koromon, Keenan Crier, and Calumon in over a hundred episodes of the popular anime Digimon and its video games, as well as for voicing Tsukasa and Elk in the anime .hack//Sign and the .hack games.