- Name: Ikuta Erina (生田衣梨奈)
- Nicknames: Eripon (えりぽん), KY Ikuta (KY生田), Kaichou (会長, literally "Chairman" as the honorary head of Niigaki's fan club)
- Birthday: July 7, 1997
- Birthplace: Fukuoka, Japan
- Blood type: A
- Height: 157cm
- Hobbies: Dance, golf
- Specialties: Typing fast on a cellphone, sleeping anywhere
- Favorite Food: Strawberry, dry-cured ham
- Favorite Color: White, black, red, yellow
- Looks Up To: Kamei Eri, Michishige Sayumi, Tanaka Reina, Maeda Yuuka, Niigaki Risa
- Hello! Project groups:
- Oha Girl Maple (2011–2012)
Became known during the audition as the "AKB-wota". Ikuta Erina was selected from Morning Musume's 9th Generation audition to join the group on January 02, 2011, along with Sayashi Riho, Suzuki Kanon, and former Hello Pro Egg Fukumura Mizuki.
The ninth generation made their official presentation on the same day they were announced as new members in Hello! Project 2011 WINTER ~Kangei Shinsen Matsuri~ concert, and they participated in the songs: "Aozora ga Itsumademo Tsuzuku You na Mirai de Are!" and "Tomo".
- [2011.08.13] Greeting ~Ikuta Erina~ (Greeting 〜生田衣梨奈〜)
- [2013.01.16] Alo Hello! Morning Musume 9 10ki DVD (Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka)
- [2014.10.xx] It’s a lovely day
- [2016.10.22] Erina (衣梨奈)
- [2012.09.10] Morning Musume｡ 9・10ki 1st official Photo Book (モーニング娘。9・10期 1st official Photo Book) (Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka)
- [2012.12.16] Alo Hello! Morning Musume 9ki Photobook (アロハロ！モーニング娘。9期写真集) (Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon)
- [2013.09.30] Morning Musume 15th Anniversary Photobook ZERO (モーニング娘。 15th Anniversary Photobook ZERO) (Michishige Sayumi, Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka, Oda Sakura)
- [2014.05.30] Michishige Camera '13-'14 (ミチシゲカメラ'13-'14) (Michishige Sayumi, Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka, Oda Sakura)
- [2014.12.15] Alo Hello! Morning Musume '14 Photobook (アロハロ！ モーニング娘。'14写真集) (Michishige Sayumi, Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka, Oda Sakura)
- [2015.02.25] Michishige Camera 2~'14graduation~ (ミチシゲカメラ2~'14graduation~) (Michishige Sayumi, Fukumura Mizuki, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka, Oda Sakura)
-  Sharehouse (シェアハウス)
- TV Programs
-  Bijo Gaku (美女学)
- [2011–2012] HELLOPRO! TIME (ハロプロ！ＴＩＭＥ)
- [2011–2012] Oha Star (as Oha Girl)
- [2012–2013] Hello! SATOYAMA Life (ハロー！ＳＡＴＯＹＡＭＡライフ)
- [2014–] The Girls Live
- [2015–] Karada Ugokasu TV (体動かすTV)
- TV Dramas
-  Suugaku♥Joushi Gakuen (数学♥女子学園)
-  Konnichiwa, Joyuu no Sagara Itsuki Desu (こんにちは、女優の相楽樹です。) (guest appearance)
-  Nestle Milo (as Oha Girl)
-  KDDI au (as Morimusume)
-  Kagome (as Zenryoku Yasai Musume)
-  Marukome Morning Misoshiru
-  Nissay Mirai Sekapaca PLAY DREAM CAMPAIGN
-  UstreaMusume
-  Michishige Sayumi no "Mobekimasutte Nani??" (道重さゆみの『モベキマスってなに？？』)
- [2012–2013] Honki DE Hichou! (本気DE飛跳!) (fan club exclusive)
- [2013–] Hello! Station (ハロ！ステ)
- Music Videos
-  Reborn~Inochi no Audition~ (リボーン～命のオーディション～) (as Ono no Komachi)
-  Stacy's Shoujo Saisatsu Kageki (ステーシーズ 少女再殺歌劇)
-  Idol Nihonryuu ~Onna Nichibu~ (アイドル日本流～おんな日舞～)
-  Zoku 11-nin Iru! Higashi no Chihei, Nishi no Towa (続・11人いる!東の地平・西の永遠)
-  Pharaoh no Haka (ファラオの墓)
- [2012–] Morning Musume no Morning Jogakuin ~Houkago Meeting~ (モーニング娘。のモーニング女学院～放課後ミーティング～)
- [2017–] marukome Morning Misoshiru Nomou yo! (marukome モーニングみそ汁 飲もうよ!)
- Her official Morning Musume image color is yellow-green. Prior to the release of 13 Colorful Character, her image color was purple.
- She was formerly with the Elegant Promotion agency as a child model.
- Her motto is "willingness is important!"
- Her favorite phrase is "I love you."
- Noted her favorite Morning Musume song to be "Ookii Hitomi" in a 2011 magazine interview, and "Shouganai Yume Oibito" in a 2012 interview.
- Her cousin is gravure idol and stage play actress Takigawa Aya (滝川綾).
- Has a KY character, or kuuki yomenai (空気よめない; "unable to read the air"), as described by Takahashi Ai and Michishige Sayumi.
- Sang Lilpri's "Little Princess Pri!" for her Morning Musume audition.
- Known to be a fan of AKB48 and Kojima Haruna.
- Appears to be good friends with Fukumura Mizuki and Michishige Sayumi.
- Is a big fan of Niigaki Risa, which began from working together in Reborn ~Inochi no Audition~. She can be seen promoting Niigaki's tour merchandise in YouTube videos, as well as always mentioning Niigaki in her blog posts. In a memorable event, Ikuta attended Niigaki's May 2012 fan club bus tour as a regular fan, during which Niigaki expressed her desire for Ikuta to inherit the yellow-green image color after her graduation. This also resulted in the fans declaring Ikuta as the "chairman" (会長, kaichou) of the Niigaki Risa fanclub, now known as the "NOK" (新垣さんを応援する会; Niigaki-san wo Ouensuru Kai, "Supporting Niigaki Party")
- Mentioned being a fan of Koda Kumi, Hamasaki Ayumi, and Hikaru GENJI.