She has dark hair in a shade of green-brown, with her eyes being the same shade. Her hair is twisted into a braid on both sides of her head, and tucked behind her head. She leaves a longer strand of fringe to fall on both sides of her face. Like all AKB0048 members and understudies, she has a heart shaped lining in her hair and her eyes.
Yui Yokoyama was born on December 8th (AKB48's birthday), 1992 in Kyoto, Japan. She joined AKB48 as a 9th generation member and is currently the captain of AKB48 Team A. She will replace Minami Takahashi as General Manager in December. She is also a member of the unit Not Yet. Since 2012 she is a regulary senbatsu member just like Haruka Shimazaki. Their relationship is called YuiPara. She ranked #10 in this year election.