- Name: Yokogawa Yumei (横川夢衣)
- Nickname: Yuumei (ゆーめい)
- Birthday: March 14, 1999
- Birthplace: Kyoto, Japan
- Blood type: A
- Height: 156cm
- Specialty: Able to bend only pinky fingers
- Hobbies: Making sweets
- Looks Up To: Michishige Sayumi
- Hello! Project groups:
- Hello! Pro Kenshuusei (2013–2016)
- Was a finalist in the Morning Musume 12th Generation "Mirai Shoujo" Audition.
- Has taken dance classes since 4th grade, at the EXILE EXPG Dance School.
- Participated in the "EX SHOW" events in 2008 and 2009.
- Is bad at sports, but enjoys watching basketball.
- Her motto is "Dreams aren't made just to be wished for, you will make them come true".
- Likes and looks up to the group E-girls.
- Her favorite Hello! Project song is "Go Girl ~Koi no Victory~" by Morning Musume.
- Wrote in a magazine that her dream is to be an idol that can sing, dance, act, and model.
- Her favorite music genre is J-Pop.
- Has an older sister named Yokogawa Ian.