
Quick answer — Yurina Furukawa voices Marilla in Princess Principal, Bianca Carlyle in Mobile Suit Gundam Thunderbolt 2, Sylphynford Tachibana in Himouto! Umaru-chan and 1 more characters.
Yurina Furukawa voices Marilla (Princess Principal), Bianca Carlyle (Mobile Suit Gundam Thunderbolt 2), Sylphynford Tachibana (Himouto! Umaru-chan), Basket Senpai (Anima Yell!).
Marilla is voiced in Japanese by Yurina Furukawa.