- 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.
- [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)
- TV 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)
-  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.