- Name: Ichioka Reina (一岡怜奈)
- Nickname: Icchan (いっちゃん)
- Birthday: February 25, 1999
- Birthplace: Tokyo, Japan
- Blood type: A
- Height: 162cm
- Specialty: Telling trains apart by color, reciting the entire Yamanote Line
- Hobbies: Comparing the firmness of train seats, creating various items with resin, watching movies
- Favorite Food: Mozuku, red caviar, natto
- Favorite Color: Light blue
- Looks Up To: Tanaka Reina, Suzuki Kanon, Kumai Yurina
- Hello! Project groups:
Ichioka Reina first appeared as a finalist in the Morning Musume 11th Generation ~Suppin Utahime~ Audition in the summer of 2012, but was not chosen as a winner. She later passed a separate audition to became a member of the Hello Pro Kenshuusei in November, and was officially introduced at the December "Hello Pro Kenshuusei Happyoukai 2012 ~12gatsu no Nama Tamago Show!~" concert on December 9, 2012. Prior to appearing in the Morning Musume audition she acted as a model for JS Girl and attended singing and dancing lessons before taking part in the 2011 EXILE audition.
On May 5, 2017 an announcement was made at the end of the "Hello! Project Kenshuusei Happyoukai 2017 ~Haru no Koukai Jitsuryoku Shindan Test~ " event revealing that Ichioka Reina and fellow Kenshuusei members Danbara Ruru and Kawamura Ayano would be debuting within Hello! Project in the future pending discussions with their parents, though it was unspecified as to if they would become part of a new group or join existing groups.
A special edition of the Hello! Project webshow "Hello Station" was released on June 26, 2017, announcing the debut placements of the three previously chosen Hello Pro Kenshuusei members and the group transfers of three Country Girls members. During the episode it was revealed that Ichioka Reina would become the leader of a new group, with the remaining members and additional information to be announced at a later date.
An update to the status of two previously announced new groups, including the group Ichioka would lead, was published through the official website on March 30, 2018. The notice revealed that the groups would begin activities between Summer and Autumn 2018 and would have some joint activities. New information on their respective concepts was also shared; Ichioka's group would focus not only on improving singing and dancing, but would be created with the aim of forming a "performance group" that utilizes various forms of physical expression. In addition, new auditions for the groups were also announced with applicant information to be revealed in late April 2018, and a note that members could be chosen from both public applicants and members of Hello Pro Kenshuusei.
- [2017.08.11] Gobaku ~We Can't Go Back~ (誤爆～We Can't Go Back～) (Ichioka Reina, Danbara Ruru, Kawamura Ayano, Takase Kurumi, Kiyono Momohime)
-  JK Ninja Girls (JKニンジャガールズ)
- TV Programs
-  Hello Pro Kenshuusei no Tadaima Kenshuuchuu! (ハロプロ研修生のただ今研修中!)
- [2014–] UP-FRONT CHANNEL Recommend
- Music Videos
-  °C-ute - "To Tomorrow" (as back dancer)
-  Juice=Juice - "Jidanda Dance" (地団駄ダンス) (as back dancer)
-  Mano Erina - "Prostyle Idol Nijiiro Memories" (プロスタイル アイドルにじいろメモリーズ) (as back dancer)
-  Sakura no Hanataba (さくらの 花束)
-  Ikinukukiseki ~Juunenme no Negai~ (イキヌクキセキ～十年目の願い～)
-  Nega Poji Poji (ネガポジポジ)
-  JK Ninja Girls (JKニンジャガール)
-  Pharaoh no Haka (ファラオの墓)
-  Attack No.1 (アタックNo.1)
-  Fushigi no Kuni no Alice Tachi (不思議の国のアリスたち)
- Was a finalist in the Morning Musume 11th Generation ~Suppin Utahime~ Audition.
- Participated in the 2011 EXILE audition.
- Was previously a model under JS Girl.
- She loves trains.
- Has an older sister named Ichioka Anna, who trains at Avex and is a member of the group ONE CHANCE.
- Had no confidence in her acting ability while in an acting club, so decided to become an idol instead.
- Her favorite sports are basketball and volleyball.
- Her motto is "Stay true to your word, up-and-coming" (有言実行、新進気鋭; Yugen Jikko, Shinshin Kiei). As a Kenshuusei her motto was "Always smile! No matter what I do I will always have a mirror in front of me to look at my face".
- Her favorite Hello! Project songs are "Chou HAPPY SONG" by Berryz Kobo and °C-ute, "Loving you Too much" by Berryz Kobo, "Brainstorming" and "Ame no Furanai Hoshi de wa Aisenai Darou?" by Morning Musume, "Kimi ga Ireba" by Buono!, and "Hitorijime Shitakatta Dake na no ni" by °C-ute.
- Wrote in a magazine that her dream is to improve her dancing and singing so her performance gives the audience happiness.
- Her favorite genres of music are Western music and J-Pop. Formerly she named K-Pop as her favorite.
- Previously listed hobbies include: listening to western music, studying kanji, dancing, singing.