Hynden Walch stars as Starfire in Teen Titans , Penny Sanchez in ChalkZone , Elsie in Stanley , Ace in Justice League and Justice League Unlimited , and Harley Quinn in The Batman .
In anime , she has voiced Amy Stapleton in IGPX , Emiri Kimidori in The Melancholy of Haruhi Suzumiya , Yutaka Kobayakawa in Lucky Star and Nia Teppelin in Tengen Toppa Gurren Lagann .
Hynden Walch