Kyoko Yamate leads the DJ unit Peaky P-key at Yoba Academy. Born into a musical family, she commands natural musical talent alongside a dedicated work ethic focused on improving her performance. Her public persona exudes a cool charisma that draws admiration from peers, establishing her as a role model for vocalists. Privately, Kyoko reveals a more emotional and passionate side, forging strong bonds with unit members like Shinobu Inuyose, her childhood friend. She experiences occasional embarrassment when others notice her sentimental moments, such as expressing a desire for deeper team discussions after observing RONDO's camaraderie.

Kyoko exhibits a distinct fascination with Happy Around!'s energetic performances, particularly captivated by Rinku Aimoto's vocal abilities and stage presence. Her leadership extends beyond musical direction, encouraging collaborative growth within Peaky P-key while navigating her own moments of introspection. In the mini-anime series "D4DJ Petit Mix," her solo travel hobby features in Episode 15 ("Solo Holiday"), depicting her exploring the city alone before encountering unexpected interactions tied to her group.

Her personal interests include visiting spiritual hotspots and consuming hamburgers, which she considers her favorite food. She owns a German shepherd named Vevo. Her name etymologically combines "mountain hand" (Yamate) and "echo child" (Kyoko), reflecting aspects of her character and musical roots.