
Quick answer — Youko Sakamoto voices Rikako Muto in Ocean Waves, Sakura Kosakai in Momo, the Girl God of Death.
Youko Sakamoto voices Rikako Muto (Ocean Waves), Sakura Kosakai (Momo, the Girl God of Death).
Rikako Muto is voiced in Japanese by Youko Sakamoto.