Watanabe Rio (渡邊璃生) is a former member of Babyraids JAPAN. She was the youngest of the group. She is also a writer under the name Kudo Ryo (工藤了). She retired from Showbiz on May 20, 2021, closing both Twitter accounts on August 20, 2021. On September 12, 2021, she was a secret guest on the talk show "Metaro's Channel OPENREC", and opened an Instagram account under her alias Kudo Ryo.