Mariko has voiced characters in several Japanese video games such as Makoto Hayasaka in Metal Angel 2, Prinvail Sugar in Dragon Shadow Spell, Febronia in the Xenosaga series, Lilith in Megami Paradise and Shinobu Nakaoka in Cross Romance; as well as over 20 other characters in different games.
On the TV anime Kyouryuu Boukenki Jura Tripper, Mariko performed the ending theme "Sunday Island". She also voiced Lady in this series.
Mariko is apart of a 7 person seiyuu group called "Idol Project". The other 6 members includes Aya Hisakawa, Mika Kanai, Kikuko Inoue, Satomi Koorogi, Rie Iwatsubo and Hinako Kanamaru. These 7 ladies are the voice actresses on the anime Idol Project.
Mariko has released 13 albums throughout her singing career so far.
13th - Vitamin Punch!
12th - Metronome
11th - Still sound ENPITSU (Neiro Enpitsu Jûni Iro)
10th - The Waves from the sky
9th - Aitakute
8th - Unfounded
7th - Try
6th - love Maus NAUTA (Daisuki na Uta)
5th - Nande Datteba(Why, Mom!?)
4th - Happy! Happy! Happy!
3rd - Vivid
2nd - Pure
1st - Kiss
Mariko has released 8 best albums, 1 live album & 7 other albums throughout her singing career so far.
8th - MY BEST FRIEND 3
7th - PURE ENERGY
6th - Colorful2
5th - Colorful
4th - My Best Friend 2
3rd - Side B Collection
2nd - My Best Friend
1st - Twinbee Vocal Paradise featuring Mariko Kouda
Mariko Kouda Concert Tour 95 to 96 office hours encore
7th - GMCD third bullet "Mariko Kouda Presents GMCD Special 2"
6th - GMCD third bullet "Mariko Kouda Presents GMCD Special"
5th - Mariko Kouda GM Presents CD II to everyone to GM 10th Anniversary
4th - Mariko Kouda Presents GM CD
3rd - Mariko Kouda Instrumental Tracks 2
2nd - Mariko Kouda Instrumental Tracks
1st - "Looking For" Soundtracks
Morning is Mariko's favorite time of the day. Other favorites includes eating chocolate, wearing silk and cotton fabrics in her clothing, the scent of citrus and companionship. Also her favorite colors are sky blue and different shades of pink.
Mariko has made a guest appearance at numerous special events throughout Japan including the "Starchild Event" on June 25, 1994; the "Tokyo Game Show Spring 1998" on March 22, 1998; the "Animate Expo 2002 Toshima Koukaidou [Kanon]" on Janurary 13, 2002; the "Flower Snow talk and mini live Lams Event Hall" on May 28, 2006 and the "Ani Chara Expo Seiyuu Talk Show" on May 4, 2007; including various others.
Mariko has voiced characters in numerous drama CDs including her role as Sabato-chan in Bokusatsu Tenshi Dokuro-chan, Megumi Juuichiya in Tokimeki Memorial, Ai in Battle Girl Ai, Saya Suzuki in Clover, and Kurisu in Eiyuu Densetsu III -Shiroki Majo-.
On the 8 episode OAV Denshin Mamotte Shugogetten, Mariko performed the first and second opening theme songs entitled "Wish" (OP1) and "Magic" (OP2).
When Mariko was little and before she ever thought of becoming a seiyuu, she wanted to be a nurse, teacher, pianist, ballerina, and other various occupations.
One of Mariko's biggest mishaps while drinking occured when she fell asleep one time and knocked over a plate of soy sauce when she drifted off. Mariko usually falls asleep immediately after she drinks alcohol.
The first person that Mariko gave real Valentines' chocolates to was a boy in her second grade class. This young boy was also Mariko's first sweetheart.
One way that Mariko says she relieves stress is by having fun and talking loudly on radio programs.
In junior high school, Mariko was in a music club. She always loved music and felt a music club would be appropriate for her. This was also the only extra-curricular activity she participated in during junior high.
On December 27, 1994, Mariko made a public recording on the radio show, "Haoujuku". It aired on December 30th. Here, she answered several questions on a segment called the "Speed question corner" with hosts Masaaki Satake and Megumi Hayashibara, and also talked about a few of her upcoming projects she's been working on.
Mariko has released 11 singles to date throughout her singing career.
11th - Matteimashita / Taiyô de Ikô!
10th - Mimikaki wo Shiteiru to / Dare no Sei demo nai Futari
9th - Cobalt / Sha-La-La Futari
8th - Looking For / Ôzora no Achira he
7th - Ame nochi Special / Iidasenakute
6th - Kaze ga Tomaranai / Soba ni Iru kara
5th - Egao de Aishiteru / Dore dake Aisareru ka Janakute
4th - Yume ha Hitori Mirumono Janai / Owaranai Encore
3rd - Watashi ga Tenshi Dattara Ii no ni / Machibuse
2nd - Taisetsu ni Oboerumono ga Issho nara Ii yo ne / Ganbare! Rônin
1st - Bokura no Suteki / Harmony
Mariko has released 13 Maxi singles to date throughout her singing career.
13th - Rainbow's Calling Them
12th - Free Wings
11th - Clear
10th - You Have Empty
9th - Earth's thoughs ~want ambition~
8th - Ta ra ra
7th - Palm Empty
6th - Flower
5th - Until Then
4th - MONSHI ROCHOU
3rd - Heart arrow
2nd - Honey
1st - SHI and out of love
Mariko is one of the few who are known as an idol seiyuu, which is where the seiyuu would rely on their own name to sell, rather than the character or anime they've done.
In 1998, Mariko played the lead role in a live action, 25 episode Japanese TV drama series entitled Setsunai.
Mariko's music career began with her producing "cute" anime songs, but has since evolved to her current pop/rock genre.
Mariko graduated from Kasukabe Kyôei High School. She then went to Tamagawa University to major in Communications before persuing a career as a seiyuu.
Mariko is employed under the talent agency, Aoni Production. She has also worked under Konami Corporation and King Records.
In the 5 episode OAV Dirty Pair Flash 2, Mariko performed the ending theme "Kimi ga Daisuki (I Really Like You)". Also in the 5 epiosde OAV sequel Dirty Pair Flash 3, Mariko performs the opening theme "Honki ni Shinai de".
Mariko stands in at 159 centimeters (5 feet, 2.5 inches) tall, weighs approximately 47 kilograms (104 lbs), has blood type B and her three sizes are 83-57-86 (cm).
Mariko: When kids record their voice for the first time, they are shocked. I always hated my voice. When I heard my voice for the first time in grade school, I was very shocked. I thought, ''What is this person?'' But finally I got used to it, and it became the same (my voice and what I hear) to me.
Mariko: At voice acting school you learn things that you have never done before. So I got scolded at a lot. There were many times when I was crying when I was going home. I thought about quitting many times. We ran every morning at school. It was in Inogashira Park. I saw that the sky was clear and beautiful, so I decided to try hard.
Mariko: When I was at an onsen(spa), a woman around 30 years old came right next to me and started talking. We were all alone. After a while, her hand was on my hip. I moved to another place, but she came right next to me again. Then she even followed me to the sauna.
Mariko: One day my dog Happy was very sick. In the middle of the night we took him to the doctor. Then he died, but he came back to life.