Yuzu Izumi is a compassionate high school student attending the same school as Fumiya Tomozaki. She possesses medium-length brown hair, frequently styled with a small bun on the right side, brown eyes, and a distinguishing mole below the left side of her mouth. Her strong aversion to conflict causes her to avoid confronting close friend Erika Konno, even when disagreeing with Erika's actions. Yuzu demonstrates dedicated focus on her interests, notably her deep admiration for Shuuji Nakamura. To become his practice partner in Attack Families, she commits to learning the game despite having no prior experience.

Yuzu forms an early friendship with Fumiya Tomozaki when he becomes her Attack Families instructor. Their dynamic involves light teasing from Fumiya and others in their social circle, which sometimes annoys her but reflects their comfortable rapport; they address each other formally. Her relationship with Shuuji Nakamura evolves from friendship to romance, making her his girlfriend. As part of this commitment, she takes up needlework, creating handmade items like a tissue case for him. She also studies diligently during his school absence, achieving high test scores partly to facilitate his return.

Within Erika Konno's social circle, Yuzu maintains friendships but struggles with Erika's domineering behavior. Over time, she develops greater assertiveness, culminating in her defending Shuuji and Fumiya against Erika's criticisms. She interacts positively with classmates like Aoi Hinami and Minami Nanami. Takahiro Mizusawa frequently teases her lightheartedly yet also shows protective concern, such as attempting to shield her from potential fallout regarding her relationship with Shuuji. Her personal interests include shopping and needlework. Her name "Yuzu" combines the characters for "excellence, superiority, gentleness" and "bell," while "Izumi" means "spring" or "fountain."