Ryouko has done the following roles in anime.

Amagami SS [2010]	Sakurai Rihoko
Amagami SS Plus [2012]	Sakurai Rihoko
DearS [2004]	Ikuhara Natsuki
Galaxy Angel [2001]	Millefeuille Sakuraba
Galaxy Angel Rune [2006]	Millefeuille Sakuraba
Girl Friend (kari) [2014]	Tachibana Kyouko
Hidamari Sketch X Hoshimittsu [2010]	Sae
Hidamari Sketch X365	Sae
Kage Kara Mamoru [2006]	Sawagashi Airi
Kurenai [2008]	Houzuki Yuuno
Lovedol [2006]	Fujita Makoto
Mahou Shoujo Madoka Magica [2011]	Shizuki Hitomi
Maria Holic	Momoi Sachi
Non Non Biyori [2013]	Fujimiya Konomi
Non Non Biyori Repeat [2015]	Fujimiya Konomi
Onegai Teacher [2001] {Episode 1,2,4,9}	female student
Pani Poni Dash [2005]	Miyata Akira [1D]
Sayonara Zetsubou-sensei	Hitou Nami
Sengoku Collection [2012]	Takeda Shingen
Tantei Opera Milky Holmes [2010-2012]	Hasegawa Hirano