Mariko has done the following roles in games.

Akumajou Dracula Gallery of Labyrinth [NDS]	Loretta
Akumajou Dracula Gallery of Labyrinth [NDS]	Stella
Angelic Crest [WIN]	Kyasarin (Captain Katherine)
Boukoku no Aegis 2035 -Warship Gunner- [PlayStation 2]	Ri- Chixyuirixien
Boys Be... Typing Renai Hakusho [PlayStation 2]	Mizuki
Dragon Knight & Graffiti [PC Engine]	girl who sells matches
Edelweiss [Windows]	Ibuki Mei sensei
Geki Sengoku Musou [PSP]	Nouhime
Green Green [PlayStation 2, Windows]	Iino Chigusa
Innocent Tears [Xbox]	Takatsukasa Kira
Interlude [Dreamcast, Playstation2, Windows] {Windows}	?
Iris no Atelier -Eternal Mana- [PlayStation 2]	Zeldalia (Zerudaria)
King of Fighters EX2: Howling Blood [GBA]	Kagami Jun
Love Smash! 5 -Tennis robo no hanran- [PlayStation 2]	Hairan
Meltylancer Re-inforce [PlayStation, Sega Saturn]	Feruna (Ferunatesu Firii)
Meltylancer The 3rd Planet [PlayStation]	Ferunatesu Firii
Minna no Golf 4 [PlayStation 2]	Sakura
Mugen no Frontier EXCEED Super Robot Taisen OG Saga [NDS]	KOS-MOS
Mugen no Frontier EXCEED Super Robot Taisen OG Saga [NDS]	Garudexia Bashirissa
Mugen no Frontier EXCEED Super Robot Taisen OG Saga [NDS]	T-elos
Mugen no Frontier: Super Robot Taisen OG Saga [NDS]	KOS-MOS
Mugen no Frontier: Super Robot Taisen OG Saga [NDS]	Kaldia
Mugen no Frontier: Super Robot Taisen OG Saga [NDS]	T-elos
Musou OROCHI [PlayStation 2]	Nouhime
Musou Orochi [PSP]	Nouhime
Musou Orochi Z [PS3]	Nouhime
NAMCO X CAPCOM [PlayStation 2]	KOS-MOS
NAMCO X CAPCOM [PlayStation 2]	Waya Hime
Ninja Gaiden 2 [XB360]	Sonia
Ninja Gaiden 3: Razor's Edge [WiiU]	Irene
Ninja Gaiden Sigma 2 [PS3]	Sonia
Nounai Esute IQ Sapuri DS [NDS]	question voice
Operator's Side [PlayStation 2]	Rio Fuxo-en Haimu
Poison Pink [PlayStation 2]	Marixi
Project X Zone 2: Brave New World [N3DS]	KOS-MOS
Rakugaki Show Time [PlayStation]	Sasami
Riviera -Yakusoku no chi Riviera- [Game Boy Advance, PSP]	Marisu
Rockman X: Command Mission [GameCube, PlayStation 2]	Marino
Sengoku Musou -Moushouden- [PlayStation 2]	Nouhime
Sengoku Musou -Moushouden- [PlayStation 2]	Soldier 3
Sengoku Musou 2 [PlayStation 2]	Nouhime
Sengoku Musou 2 Empires [PlayStation 2]	Nouhime
Sengoku Musou 2 Empires [PlayStation 2]	sonota
Sengoku Musou 2 Moushouden [PlayStation 2]	Nouhime
Sengoku Musou 2 Moushouden [PlayStation 2]	sonota
Sengoku Musou 3 [Wii]	Nouhime
Sengoku Musou [PlayStation 2]	Nouhime
Sengoku Musou [PlayStation 2]	Soldier 3
Sentimental Graffiti -Yakusoku- [PlayStation]	Sawatari Honoka
Sentimental Graffiti 2 [Dreamcast, WIN]	Sawatari Honoka
Sentimental Graffiti [Sega Saturn, WIN, Playstation]	Sawatari Honoka
Sentimental Journey [PlayStation]	Sawatari Honoka
Shin Sangoku Musou [Playstation 2, PSP] {PSP}	?
Sore ha maichiru sakura no you ni [Windows]	Mori Aoba
Sore ha maichiru sakura no you ni [Windows]	Yuuki Hikari
Super Robot Taisen Original Generations [PlayStation 2]	Ekidona I-sakki
Tactical Fighter [Sega Saturn]	Matsumoto Ririna
Tales of the Abyss [PlayStation 2]	Nebilim
Tales of the Abyss [PlayStation 2]	Nefly Curtiss
Time Crisis 4 [Arcade]	USAF First Lieutenant Elizabeth "Beth" Conway
Tobal 2 [PlayStation]	Epon
Toki no Kuni no Elfenreet [Windows]	Aster
Toushinden Subaru [PlayStation]	Iosu
Wangan Trial Love [Sega Saturn]	Kawakami Saya
Xenoblade X [Wii U]	Avatar
Xenosaga Episode I -Der Wille zur Macht- (Chikara he no ishi) [PlayStation 2]	Kos-Mos
Xenosaga Episode II -Jenseits von Gut und Bose- (Zen'aku no higan) [PS2]	Kos-Mos
Xenosaga Episode III: Also Sprach Zarathustra [PlayStation 2]	KOS-MOS
Xenosaga Episode III: Also Sprach Zarathustra [PlayStation 2]	T-elos
Xenosaga Freaks [PlayStation 2]	Kos-Mos
Yggdra Union: We'll never fight alone [PSP]	Zilva
Yumeria [PlayStation 2]	Neito