|School||Hanasakigawa Girls' High School|
|Favorite Food||Junk food (especially gummy candy)|
|Least Favorite Food||Carrots|
Sayo has slanted green eyes and long, light, teal hair about navel length with her forelocks worn behind the ear with a curl on the end. Her bangs are neatly parted with the exception of a single loose lock.
Her casual attire is simple with a tomboyish, yet cute tone, mixing pale and dark shades.
A serious and fussy girl, Sayo can come off as somewhat cold in nature. She would never cut corners or be shoddy about things; because of that, she lives her life too seriously for her own good.
In comparison to her sister Hina, Sayo is fairly stiff and sharp, and is highly stubborn when trying to do what she believes is best for others. Like Yukina, she is prone to making snide or rude remarks.
Deep down, however, Sayo has an inferiority complex and feels as if she is not as talented as her sister. While Hina can master new skills in the first attempt, Sayo tends to work twice as hard in an effort to "catch up" to her and stand on equal ground with her as a guitarist.
Sayo is also fairly formal, and addresses everyone with their last names, except for her sister and Udagawa Tomoe (if both Ako and Tomoe are present at the same time, or if Sayo's talking about Ako while Tomoe is present).
A list of characters Sayo interacts with in the game.
|Hard Worker||1★||Score Up||Band Story 1 Chapter 1|
|Onstage||2★||Life Recovery + Score Up|
|Twin Problems||3★||Score Up|
|Good Sound||2★||Perfect Lock + Score Up||A Song Unfinished|
|Ice Cream In Summer||2★||Perfect Lock + Score Up||Don't leave me, Lisa!!!!|
|Tanabata Pair||4★||Score Up||Twinkling Milky Way Gacha|
|Teardrops and Rainfall||3★||Life Recovery + Score Up||Rainy Blue Rose Gacha|
|Making Cookies||3★||Score Up||Mismatched!? Silly Sweets Classroom|
|A Captivating Hand||4★||Perfect Score Rate Up||New Years Dream Festival|
|Blue Roses in Harmony||2★||Score Up|
|Fledgling Tank||3★||Life Dependent Score Up||Our Party's Journey - Neo Fantasy Online Gacha|
|Honorable Mind||4★||Perfect Lock + Score Up||~Newly Composed Score~ Melodious Gacha|
|This Time I Will||3★||Life Recovery + Score Up||Neo-Aspect|
|With The Rain||3★||Perfect Lock + Score Up||Roaring Rimshot Gacha|
|What I Can Say||2★||Score Up||Growing Up Sisters!|
|Glittering Water Magic||4★||Life Dependent Score Up||Mysterious Coral Reef Limited Gacha|
- ESP Guitars will release a real-life version of Sayo's guitar, , alongside Lisa's bass, and other Bandori merchandise relating to Roselia.
- She is the tallest Roselia member.
- She is a member of the Archery (Kyudo) Club and Disciplinary Committee.
- Sayo loves reading music magazines and in one in-game conversation, was even shown carrying seven of them in her school bag.