Sayaka's wiki page: https://danganronpa.fandom.com/wiki/Sayaka_Maizono

As described by the wiki, "Sayaka Maizono (舞園 さやか), is a student in Hope's Peak Academy's Class 78th, and a participant of the Killing School Life, featured in Danganronpa: Trigger Happy Havoc. Her title is the Ultimate Pop Sensation (超高校級の「アイドル」 lit. Super High School Level Idol). 

Seeing as she's an idol, Sayaka has a cheerful, sweet, and supporting personality. Despite her idol career, Sayaka actually enjoys cooking. She also likes reading and playing Othello. 

Sayaka mentions that she often finds herself focused on a particular person, but pushes these thoughts out of her mind to commit herself further to her idol career.

She has an amazing intuition, as she can easily tell what people are thinking. She often joked about being psychic, only to admit that she was kidding later on. 

Sayaka was raised solely by her father, as her mother had passed away. Because her father worked long hours every day, Sayaka spent a lot of time alone at home. The only thing that kept her from feeling lonely was the idol live show she watched on television. The idol girls' smiles were a source of strength for her, and she became determined to become an idol herself so that she could give strength to other people. She did some bad things and made many sacrifices in order to achieve her dream.

Sayaka and Makoto Naegi both went to Sixth Black Root Middle School, though were unaware of each other's character because they weren't in the same classes and social groups. On one occasion, Sayaka saw Makoto nurse an injured crane back to health after it got lost and stuck in the school pool. This action touched Sayaka, and, after that incident, she wanted to get to know Makoto more. Unfortunately, they ended up graduating middle school without interacting with each other, and went to different high schools."