This completed figure presents Kokoro in a bright stage costume inspired by BanG Dream! Girls Band Party!. The pose is energetic, with one arm raised toward a microphone stand and the other slightly extended, implying she is mid-song. Her long, pastel-pink hair flows with the motion of the performance, and her cheerful facial expression conveys her bubbly personality. The outfit features layered ribbons, a short frilly skirt, thigh-high stockings, and glossy boots, all painted with delicate shading to highlight folds and accessories. A compact base evokes a concert floor with subtle musical motifs, ensuring the character stands firmly while exuding vibrancy and charm.

Kokoro Tsurumaki is depicted here as the heart of Hello, Happy World!, a spirited performer who believes in the power of music to lift friends and brighten days. In BanG Dream! Girls Band Party!, she embraces every stage with contagious enthusiasm, turning even small gatherings into joyful performances. Her backstory centers on friendship, perseverance, and learning to trust her voice in front of an audience. Off stage she is warm and playful, often encouraging teammates and fans, and she channels that optimism into bold, memorable live moments on screen and in spirit.