A floating yellow ball with an upside-down face in Di Gi Charat. Ends all of his sentences with "-gema."
Gema became associated with Love Live! Sunshine!!'s Tsushima Yoshiko when Yoshiko won an election to become the image girl of the Numazu Gamers store, and a resulting picture in Dengeki G's magazine depicted Gema as one of her "little demons" (post #2786245).