Rika Morinaga (森永 理科, Morinaga Rika, born April 25, 1980 in Tokyo, Japan) is a Japanese singer and voice actress represented by Exellex. She is best known for her role as Souseiseki in Rozen Maiden and Makoto "Mako-chan" in Minami-ke. Morinaga is also the lead singer of the goth rock band function code.