Kokoro Tsurumaki is a vibrant and energetic character from the anime series BanG Dream! She is the lead vocalist and leader of the band Hello, Happy World! Known for her infectious enthusiasm and boundless optimism, Kokoro is always on the lookout for ways to make the world a happier place. Her wealthy background allows her to pursue extravagant ideas, often leading to comedic situations. Her unwavering positivity and unique perspective on life make her a central and beloved character in the series.