- Name: Shinoda Mariko (篠田麻里子)
- Nicknames: Mariko-sama (麻里子様), Maririn (まりりん)
- Birthdate: March 11, 1986
- Birthplace: Fukuoka, Japan
- Blood Type: A
- Hobbies: Fashion, Shopping
- Audition song: None
- Height: 168cm
- Bust: 87cm
- Waist: 57cm
- Hips: 85cm
After finishing high school Shinoda Mariko auditioned for the first generation of AKB48 and failed. Not wanting to give up her dreams she started working part time in the cafe on the same floor as the AKB48 theater. At the time of AKB48's humble beginnings, a vote box for fans was placed in the lobby to write the name of the member they liked. They encountered a number of votes of an unknown girl whom they found out was Shinoda Mariko who worked part time at the cafe. Intrigued by this, Akimoto Yasushi challenged her to remember 12 songs in four days in turn she'll be able to perform on stage. Two months after the group debuted, through customer's feedback she was able to join the group before the second generation and is the only member referred to as generation 1.5.
It is for this reason that she is not present in the DVD of Team A's first stage but can be seen in the PV to the single "Skirt, Hirari"; the first she participated in, unlike the rest of Team A who had all previously participated in the single "Sakura no Hanabiratachi."
It was not long after joining that Shinoda began to exhibit her potential and improved rapidly - while it had seemed that Akimoto had chosen his consistent leads in "Skirt, Hirari" as Sukahira Seven and intended to stick with them, over time he appears to have changed his mind and pushed Shinoda to the group's forefront in place of Narita Risa.
Shinoda is perhaps most widely known for her love of Hamtaro, and the song "Koike" from Team A's third stage, in which she took all of the speaking parts along with a lead singing role. On July 21, 2013, she graduated from AKB48, with her graduation ceremony taking place in her hometown of Fukuoka.
AKB48 Song Participation
- Skirt, Hirari (スカート、ひらり)
- Aitakatta (会いたかった)
- Seifuku ga Jama wo Suru (制服が邪魔をする)
- Keibetsu Shiteita Aijou (軽蔑していた愛情)
- Boku no Taiyou (僕の太陽)
- Romance, Irane (ロマンス、イラネ)
- Sakura no Hanabiratachi 2008 (桜の花びらたち2008)
- Baby! Baby! Baby!
- Oogoe Diamond (大声ダイヤモンド)
- 10nen Zakura (10年桜)
- Namida Surprise! (涙サプライズ!)
- Iiwake Maybe (言い訳Maybe)
- Sakura no Shiori (桜の栞)
- Majisuka Rock 'n' Roll (マジスカロックンロール)
- Ponytail to Chouchou (ポニーテールとシュシュ)
- Majijo Teppen Blues (マジジョテッペンブルース)
- Heavy Rotation (ヘビーローテーション)
- "Chance no Junban" single
- Sakura no Ki ni Narou (桜の木になろう)
- Dareka no Tame ni ~What can I do for someone?~ (誰かのために)
- Everyday, Katyusha (Everyday、カチューシャ)
- Flying Get (フライングゲット)
- Kaze wa Fuiteiru (風は吹いている)
- Ue kara Mariko (上からマリコ)
- GIVE ME FIVE!
- Sweet & Bitter (スイート&ビター) (Selection 6)
- Manatsu no Sounds good! (真夏のSounds good!)
- Choudai, Darling! (ちょうだい、ダーリン!)
- Gingham Check (ギンガムチェック)
- Yume no Kawa (夢の河)
- Kodoku na Hoshizora (孤独な星空) (Team A)
- Eien Pressure (永遠プレッシャー)
- So long!
- Ruby (Shinoda Team A)
- Sayonara Crawl (さよならクロール)
- Ikiru Koto (イキルコト) (Team A)
- Koisuru Fortune Cookie (恋するフォーチュンクッキー)
- Koko ni Ita Koto
- Tsugi no Ashiato
- Kiss wa Dame yo (キスはだめよ) (2nd Unit)
- Kikyou (帰郷)
- Himawari (向日葵) (1st Unit)
- Confession (1st Unit)
- Manatsu no Christmas Rose (真夏のクリスマスローズ)
- Saboten to Gold Rush (サボテンとゴールドラッシュ)
AKB48 Senbatsu Elections
- Ranked 3rd in the 1st Senbatsu Election, held in 2009
- Ranked 3rd in the 2nd Senbatsu Election, held in 2010
- Ranked 4th in the 3rd Senbatsu Election, held in 2011
- Ranked 5th in the 4th Senbatsu Election, held in 2012
-  Hanabi no Kakehashi
- [2011.10.xx] Mariko-Sama no Orikosama!
- [2011.10.xx] MARIKO MAGAZINE
- [2011.10.xx] M girl 2011-2012 AUTUMN/WINTER (Cover & Feature)
- Although she did not pass the original auditions for AKB48, Shinoda was added to the group in early 2006, following feedback and popular demand from fans. As a result, she is often referred to as the "1.5th generation" member of AKB48, due to joining the group before the second generation auditions, but shortly after the original members' 2005 debut. Remaining a founding member of Team A onwards, she was appointed as team captain during the AKB48 team shuffle in August 2012, succeeding Takahashi Minami. Shinoda announced her graduation at the AKB48 32nd Single Senbatsu Sousenkyo, set to take place in her hometown of Fukuoka at the end of July. Her graduation was celebrated at Yafuoku Dome on July 21, 2013, and her final performance at the AKB48 Theater took place on July 22. Yokoyama Yui was appointed as the succeeding captain of Team A.
- She is close with Oku Manami, Minegishi Minami, Takahashi Minami, Maeda Atsuko, Kojima Haruna, and Noro Kayo.
- Her oshimen are Oku Manami, Matsui Jurina, and Komori Mika.
- Favorite food: curry rice
- Favorite drink: 100% juice
- Favorite artist: Lady Gaga
- Favorite TV show: Suberanai Hanashi
- Favorite magazine: MORE, ViVi, Glamorous, GISELe, sweet
- Favorite season: Spring & Fall
- Favorite brand: NINE and Aula Aila
- Favorite town: Harajuku
- Favorite AKB48 single: Iiwake Maybe