On November 2, it was announced on ANGERME's YouTube Channel that Kawana had joined ANGERME as a 9th generation member, alongside Matsumoto Wakana and Tamenaga Shion. She and the rest of the 9th generation started performing with the group on December 9, at the ANGERME Concert 2020 ~Kishotenketsu~ Funaki Musubu Sotsugyou Special concert. 
On December 7, she celebrated her 18th birthday at a fanclub event titled ANGERME Kawana Rin Birthday Event 2021 with two shows at LANDMARK HALL. In compliance with government policy, cheering, crowding, standing, and closeness in the venue were prohibited, and wearing masks were required to enter.
She has an older sister.
She graduated from high school in March 2022.
Here is a list of nicknames that was used to refer to Kawana Rin:
- Narin-chan (なりんちゃん): Nickname used by members.
- Keronnu (ケロンヌ): She got it when they shot ANGERME DVD Magazine Vol.29. On the part where they decide nicknames for the new members, she revealed that she likes frogs. There, the senior members started thinking for a nickname that starts with 'Kero' (the equivalent of 'ribbit' in Japanese). Immediately, they thought of affixing 'nnu' at the end just like Hashisako Rin's nickname to Tamenaga Shion, 'Shionnu'. They found it funny and settled for it.
- Kero or Kero-chan (ケロ or ケロちゃん): Nickname used by members.
- Keroppi (ケロッピ or けろっぴ): From the Sanrio character. Used by Takeuchi Akari.
- Name: Kawana Rin (川名凜)
- Nicknames: Narin-chan (なりんちゃん)
- Birthdate: December 6, 2003
- Birthplace: Chiba, Japan
- Blood Type: B
- Western Zodiac: Sagittarius
- Eastern Zodiac: Goat
- Hello! Project Status:
- 2020-11-02: ANGERME member
- UP-FRONT PROMOTION Status:
- 2020-11-02: Member
- ANGERME Color:
- Hello! Project Groups:
- ANGERME (2020-present)
- [2020-] Hello! Project Station
- She shares the same birthday with former Morning Musume 2nd generation member Yasuda Kei.
- She plays the violin.
- She's left-handed
- She and Matsumoto Wakana already knew who fellow 9th generation member Tamenaga Shion was, because they both followed Hello! Project and Hello Pro Kenshuusei.
- She loves frogs.