pupil (of the eye)

Tanjiro is a red-haired guy with red eyes. He wears a green and black kimono with a checkered pattern and a hunter's uniform. He works as a demon hunter. He is kind and can breathe water, fire, and the sun.

Inosuke is a male demon hunter, but he is friends with Tanjiro, Nezuko, and Zenitsu. He loves to fight, is a bit childish, and is kind. He has shoulder-length blue hair, green eyes, and feminine features. He doesn't wear a kimono and goes shirtless, wearing boar skin trousers and a boar head as a mask. He uses the breath of the beast.

Zenitsu is a yellow-haired boy. His hair was black as a child, but after he was struck by lightning, it turned yellow. He wears a yellow kimono and a hunter's uniform. He works as a demon hunter. He is kind but a bit of a whiner. Because he was bullied for his whininess throughout his childhood, he grew up insecure.
possesses the breath of lightning