Kohaku is a warrior from Ishigami Village and one of the earliest allies of Ishigami Senkuu in Dr. Stone. Known for her agility, sharp instincts, and unwavering loyalty, she becomes one of the core members of the Kingdom of Science. Despite her strength and straightforward attitude, she cares deeply for her friends and is especially devoted to protecting her sickly twin sister, Ruri (Dr. Stone) .
Kohaku is a young woman with striking blue eyes and long, golden-blonde hair that she ties into a high, flowing ponytail, secured with a simple band. Her bangs are uneven and frame her face, giving her a wild, energetic look that matches her personality. Built athletic and lean, Kohaku has exceptional mobility, allowing her to sprint, jump, and climb with ease. Her physical prowess is notable even among trained fighters.
Her usual outfit is a short, sleevelessblue dress made from primitive materials, cut for mobility rather than decoration. She often wears fur-lined accessories, such as a neck wrap or shoulder guard, and simple sandals suited for running across rough terrain. During colder environments or expeditions, she switches to heavier furs and layered clothing while still keeping her movement unrestricted. No matter the situation, Kohaku carries herself with the alert posture of a seasoned hunter, always ready to act.
