a guy teaches swrod play to students in a training ground

Sensei

supporting

An elderly, wise Japanese martial arts master with a calm, focused demeanor. He has short, neatly combed silver hair and a trimmed white beard. His eyes are sharp and discerning, reflecting years of experience. Sensei wears a traditional pristine white karate gi with a black belt, signifying his mastery. His movements are fluid and precise, embodying grace and strength. He carries a wooden bokken during practice.

Hiro

supporting

A teenage Japanese boy with a determined but often clumsy expression. He has short, slightly messy black hair and earnest brown eyes. Hiro wears a slightly ill-fitting white karate gi, often wrinkled from his struggles, and a white belt. He frequently sweats from effort, his movements initially awkward but full of earnest intent. He practices with a wooden bokken.

Sakura

minor

A diligent teenage Japanese girl, one of Sensei's students. She has long, straight black hair tied back in a neat ponytail, and observant dark eyes. Sakura wears a clean white karate gi with a white belt, her posture generally good. She often watches Hiro with a supportive and slightly impressed expression as he trains.

Ren

minor

A focused teenage Japanese boy, another student in Sensei's dojo. He has short, spiky black hair and serious, dark eyes. Ren wears a crisp white karate gi with a white belt, his movements more refined than Hiro's. He observes Hiro's progress with a keen and sometimes impressed gaze.