Mariko has done the following roles in anime.

3x3 Eyes [1991-1992] {volume 3}	Girl
A-LI-CE [2000]	Maria (SS1X)
Air (TV) {Episode 2}	girl
Anime Sekai no Douwa [1995] {Episode 5}	Gureeteru
Anpan-man	Herb chan
Bush Baby	student
Chance Triangle Session [2001]	Reika
Crayon Shin-chan	Fushigi Majokko Marii-chan
Danasite 999.9	Yumi
Denshin Mamotte Shugogetten	Shugogetten Shaorin
Dirty Pair Flash	Yuri
Dragon Half	Rufa
Dragon Quest Dai no Daibouken	Gome
Dragoon	Myuu
Fortune Quest L {Episode 17-18}	Max
Gestalt	Suzu
Getter Robo Gou {Episode 25}	girl
Ginga Ojousama Densetsu Yuna	Shiori
GS Mikami [1994]	Okinu-chan
GS Mikami [1994] {Episode 30}	josei
GS Mikami the Movie [1994]	Okina
Haiyore! Nyaruko-san [2012]	Luhey Jistone
Haunted Junction	Hasegawa Hanako
Idol Project [1995-1996]	Mimu Emilton
Jura Tripper	Garnet/ojou
Kanon [2002]	Minase Nayuki
Kanon [2006]	Minase Nayuki
Kemono Friends [2017]	Moose
Kingyo Chuuihou! [debut]	Akeko
Kingyo Chuuihou! {Episode 1,2,6}	female student
Kore ha Zombie Desuka Of The Dead [2012] {episode 4-6}	Yuu (imaginary)
Macross II	Amy
Mamotte Shugogetten [1999]	Shugogetten Shaorin
Maps [1987] {1994}	Kimizuka Hoshimi
Marmalade Boy	Koishikawa Miki
Meiken Lassie {Episode 9-11,23-26}	Priscilla
Miyuki-chan in Wonderland	Miyuki-chan
Monster Farm [1999-2000]	Holly
Nintama Rantarou	Yuki
One Piece [1999-] {Episode 8-16}	Kaya
One Piece [1999-]	Kaya
Pocket Monsters {Episode 185}	Sakura
Porphy no nagai tabi [2008]	Erena
Quo Vadis	Maria
Ryuuki Denshou	Mew
Seishoujo Kantai Virgin Fleet	Haruoshimi Ise
Shonan Bakusouzoku [1987]	?
Shounan Jun'aigumi	Imaina Miki
Space Oz Adventure	Dorothy
Spectral Force	Azerea
Tanoshii Willow Town [1993-1994]	Annie
Tatoon Master	Nima
Tekkaman Blade II	Yumi Francois
Twinbee Paradise	Madoka
Wataru	Oru
Zettai Karen Children [2008] {Episode 13,51}	Akashi Yoshimi