- Name: Kasahara Momona (笠原桃奈)
- Nickname: Kassa (かっさー)
- Birthdate: October 22, 2003
- Birthplace: Kanagawa, Japan
- Blood Type: A
- Height: 160cm
- Hobbies: Eating candy, playing games, athletics, dancing, cycling with her family
- Specialties: Ballet, acrobatics, swings, dancing
- Favorite Food: Peaches, fruit
- Least Favorite Food: Meat
- Favorite Color: Purple, pink
- Looks Up To: Sato Masaki, Kudo Haruka, Michishige Sayumi, Kamei Eri
- Hello! Project groups:
Kasahara Momona joined Hello! Project as a member of Hello! Pro Kenshuusei, and was officially introduced through a website announcement on April 27, 2015. She was revealed to be a new member of ANGERME in a surprise announcement on July 16, 2016, during the first day of the Hello! Project 2016 Summer concert tour, where she also performed with the group.
On June 21, 2021 Kasahara's graduation from ANGERME and Hello! Project was announced to take place by the end of the year, with a specific date to be announced later. The official announcement revealed discussions had begun around the end of 2020. In her personal statement she apologized for the abruptness of the announcement, discussed her love for ANGERME and her plans to study singing and dancing abroad in order to realize a new dream, and offered her thanks to those that have supported her.
- [2019.10.22] Momona
- [2019.05.24] Angermook (アンジュルムック) (Wada Ayaka, Nakanishi Kana, Takeuchi Akari, Katsuta Rina, Murota Mizuki, Sasaki Rikako, Kamikokuryo Moe, Kasahara Momona, Kawamura Ayano, Funaki Musubu, Oota Haruka, Ise Layla)
- [2020.08.12] BABY'S BREATH VOL.4 (Photographer)
- TV Programs
- [2016–2019] The Girls Live
- [2019–2020] AI・DOL PROJECT
-  ANGERME no Hello Pro! TOKYO Sanpo (アンジュルムのハロプロTOKYO散歩)
- Net Dramas
-  Hobonichi no Kaidan (ほぼ日の怪談。)
- Net Programs
- [2016–] Hello! Station (ハロ！ステ)
-  Hello Pro no Oshigoto Challenge! (ハロプロのお仕事チャレンジ!)
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019 (ハロプロ紅白対抗 ザ☆バトル2019)
-  Hello Pro no Oshigoto Challenge! 2 (ハロプロのお仕事チャレンジ!2)
-  Hello Pro no Oshigoto Challenge! 3 e no Michi ~Kinkyuu Kikaku Kaigi~ (ハロプロのお仕事チャレンジ！3への道 ~緊急企画会議~)
-  Mode (モード)
-  Yumemiru Television (夢見るテレビジョン)
-  Attack No.1 (アタックNo.1) (as Obata Suzume)
- Her official ANGERME image color is dark pink.
- Her favorite sport is ballet.
- She practiced ballet for 9 years.
- Her motto is "With all of one's might".
- Her favorite Hello! Project songs are "Kimagure Princess" and "Yuugure wa Ameagari" by Morning Musume.
- Her favorite ANGERME songs are "Dondengaeshi", "Gashinshoutan", and "Jitensha Chiririn".
- Thinks her strength is her strong sense of right and wrong.
- Believes her weakness is being scatterbrained.
- Considers her charm point to be her pale skin.
- Her favorite subjects are P.E. and History.
- Her favorite music genre is classical.
- Likes The Beatles because of her parents.