Mariko has done the following roles in games.

Angelic Crest [WIN]	Ru-shia (Luqiya)
Aoi Namida [Windows, Xbox] {Xbox}	Fujiwara Mana
Blade Arts: Tasogare no Miyako Ruruie [PlayStation]	Irumu
Blade Arts: Tasogare no Miyako Ruruie [PlayStation]	Brigit Landers
Burai II: Yamikoutei no Gyakushuu [PC Engine]	Boroneezu
CAL II [PC Engine]	Carol
Card of Destiny [Dreamcast]	Rufuxi-na Rijixerudo
Cross Romance [Playstation]	Nakaoka Shinobu
Daisuki [Sega Saturn]	Sishell Marceille
Der Langrisser [PC FX]	Liana
Der Langrisser [PC FX]	Lana
Doki Doki Pretty League -Lovely Star- [PlayStation]	Nonohara Chiaki
Doki Doki Pretty League [Playstation]	Nonohara Chiaki
Doki Doki Pretty League Nekketsu Otome Seishunki [Playstation]	Nonohara Chiaki
Doukyuusei [PC Engine]	Sakuragi Mai
Doukyuusei if [Sega Saturn]	Sakuragi Mai
Doukyuusei Mahjong [Playstation]	Sakuragi Mai
Dragon Half [PC Engine]	Rufa
Dragon Knight 3 [PC Engine]	Mary
Dragon Shadow Spell [PlayStation 2]	Prinvail Sugar
Elfin Paradise [Playstation]	Citron
Fist [Playstation, Sega Saturn]	Bunny May
Free Talk Studio [Sega Saturn, Win95, Playstation]	Kousaka Mari
Free Talk Studio [Sega Saturn, Win95, Playstation]	Kawai Natsumi
Ginga Ojousama Densetsu Yuna 2 Eien no Princess [PC Engine]	Jinguuji Shiori
Ginga Ojousama Densetsu Yuna 3 Lightning Angel [Sega Saturn]	Shiori
Ginga Ojousama Densetsu Yuna [PC-Engine]	Ottori no Shiori
Ginga Ojousama Densetsu Yuna Final Edition [Playstation]	Jinguuji Shiori
GS Mikami (Ghost Sweeper Mikami) [PC Engine]	Okinu
Kanon [Dreamcast]	Minase Nayuki
Kanon [PS2]	Minase Nayuki
Kanon [PSP]	Minase Nayuki
Kouda Mariko no Dokidoki On Air [WIN]	Kouda Mariko
L@ve Once Mermaid's Tears [PS3]	Takanashi Shione
Langrisser I and II [Playstation]	Liana
Langrisser I and II [Playstation]	Lana
Lightning Legend [Playstation]	Raiou Daigo
Madou Monogatari I [PC Engine]	Madoukyuu 2 (blue)
Megami Paradise [PC Engine]	Riris
Megami Paradise II [PC FX]	Riris
Mercurius Pretty End of the Century [Dreamcast]	Homunculus (Fancy)
Metal Angel 2 [PC Engine]	Hayasaka Makoto
Minna no Golf 3 [Windows]	Aika
Minna no Golf 3 [Windows]	Nanako
Minna no Golf 4 [PlayStation 2]	Nanako
Mitsumete Knight [Playstation]	Anne
One Piece -Tobidase Kaizokudan [PlayStation]	Kaya
Otometeki Renai Kakumei Raburebo!! [PlayStation 2, PSP]	?
Para Para Paradise [FM Towns, Windows]	Akane
Pocket Love [Game Boy]	Saiki Ruruna
Popful Mail [PC Engine]	Mail
Princess Connect Re:Dive [smartphone]	Misato
Project X Zone 2: Brave New World [N3DS]	Urashima Chizuru
Puyo Puyo CD Tsuu [PC Engine]	Trio The Banshee
Quiz DE Gakuensai [PC Engine]	Miina
Quo Vadis [Sega Saturn]	Maria Cinder
Rapyuruss Panic [Sega Saturn]	mystery person 2
Ryuuki Denshou Plus [Windows]	Myuu
Seishoujo Kantai Virgin Fleet [Playstation]	Haruoshimi Ise
Sparkling Feather [PC FX]	Diamond Feather
Spectral Force 2 -Eien naru kiseki- [WIN95/98/ME]	Azelea
Spectral Force 2 [PlayStation]	Azerea
Spectral Force [Windows]	Azelea
Spectral Force: Itoshiki Ja'aku [PlayStation]	Azeria
Super Real Mahjong P IV [Arcade, PC Engine]	Aina
Super Real Mahjong P V [Arcade, PCE, PC FX, SS, 3DO, WIN95]	Aina
Touhou Chin'yuuki Halfling Ha [Playstation]	Goku
Twinbee RPG [PlayStation]	Madoka
Twinbee Taisen Puzzle-dama [Playstation]	Madoka
Voice Paradice Excella [Playstation]	Jasmin
Voice Paradice Excella [Playstation]	Citron
Voice Paradice Excella [Playstation]	Cinamon
Voice Paradise [PC FX]	Jasmin
Voice Paradise [PC FX]	Citron
Voice Paradise [PC FX]	Cinamon
Win Back [Nintendo 64, PlayStation 2]	Lisa Roberts
Xenosaga Episode I -Der Wille zur Macht- (Chikara he no ishi) [PlayStation 2]	Faberonia
Xenosaga Episode II -Jenseits von Gut und Bose- (Zen'aku no higan) [PS2]	Feburonia