Juri Saijo is a 17-year-old second-year high school student from Kanagawa Prefecture, standing 160 cm tall and weighing 48 kg. Her birthday is November 26th, making her a Sagittarius with blood type O. Her physical measurements are 75-58-78 cm, and she is right-handed. She enjoys listening to Western music and playing games, excelling in sports, particularly basketball.

Initially skeptical about fitting the conventional idol image, Juri presents a cool, boyish exterior with a rough way of speaking that can seem intimidating. Despite this tough facade, she possesses a fundamentally kind-hearted and pure nature, though she struggles to express her feelings honestly. Encouraged to embrace her authentic self, she gradually accepts her role as an idol, committing to the path with determination to see how far she can go.

Within her unit, Houkago Climax Girls (unit color: yellow), alongside Kaho Komiya, Chiyoko Sonoda, Rinze Morino, and Natsuha Arisugawa, her supportive nature emerges. She helps Chiyoko Sonoda find her individuality and assists Kaho Komiya with homework, even participating in Kaho's "tokusatsu theatrical presentation." However, Juri becomes visibly embarrassed when others acknowledge these kind acts, revealing a shy modesty beneath her tough exterior.

Her background includes watching tokusatsu shows with her older brother during childhood. She is notably uncomfortable with or inexperienced in modern technology. A significant past experience involves basketball, which she played seriously until an injury forced her to quit against her wishes. The kanji in her name translate to "tree" (樹) and "village" (里) for Juri, while her surname Saijo means "west" (西) and "castle" (城).