- Birth Name: Hirose Ayaka (広瀬彩海)
- Nickname: Ayapan (あやぱん)
- Date of Birth: August 4, 1999
- Place of Birth: Kanagawa, Japan
- Blood Type: O
- Height: 157cm
- Specialty: Speed reading, memorizing, drums, roundoff, quick recitation of Taketori Monogatari
- Hobbies: Reading, watching baseball, riding roller coasters
- Favorite Color: Blue
- Favorite Food: Bread, pastry
- Looks Up To: Sugaya Risako, Fukuda Kanon, Ikuta Erina
- Hello! Project groups:
- Other groups:
- Nice Girl Project! Kenshuusei (2011–2014)
Hirose Ayaka was introduced as a member of the Nice Girl Project! Kenshuusei in September 2011 during the "Trainees Collection Vol.2" event. She later participated in the 2012 "Morning Musume 11th Generation Suppin Utahime" audition, but failed to pass. After the Nice Girl Project! Kenshuusei program was discontinued in November 2014, Ayaka and several other members were introduced as new Hello! Pro Kenshuusei at the "Hello! Pro Kenshuusei Happyoukai 2014~November-December no Nama Tamago Show!~".
On January 2, 2015 she was revealed to be part of a new eight member group, later named Kobushi Factory. The unit consisted entirely of trainees from Hello! Pro Kenshuusei, including Fujii Rio, Nomura Minami, Ogawa Rena, Hamaura Ayano, Taguchi Natsumi, Wada Sakurako, and Inoue Rei.
- [2016.09.xx] Greeting ~Hirose Ayaka・Inoue Rei~ (Greeting ~広瀬彩海・井上玲音~)
- [2017.01.14] Hirose Ayaka / Inoue Rei Mini Photobook "Greeting -Photobook-" (広瀬彩海・井上玲音ミニ写真集「Greeting-Photobook-」) (Hirose Ayaka, Inoue Rei)
-  JK Ninja Girls (JKニンジャガールズ)
- TV Programs
- [2015–] The Girls Live
- [2015–] Hello! Station (ハロ！ステ)
- Music Videos
- Radio Programs
- [2018–] Kobushi Factory no Yozora de Aimashou (こぶしファクトリーの夜空で逢いましょう)
- Radio Dramas
-  Week End Survivor ~Purge Game~ (Week End Survivor~粛清ゲーム~)
- Is a fan of the Yomiuri Giants baseball team.
- Her favorite sport is baseball.
- Practiced singing for 7-8 years before becoming a trainee.
- Favorite fiction genres are mystery and science fiction.
- Her favorite Hello! Project songs are "Onaji Jikyuu de Hataraku Tomodachi no Bijin Mama" and "Watashi no Kokoro" by ANGERME.