Tanjiro Rengoku Inosuke Zinitsu

A timid guy with yellow hair and yellow eyes, a black uniform with a yellow tint, a sparrow called Chirik, is in love with Tanjiro's sister, a yellow haori with white triangles, and uses lightning breath.

His hair is cut in a bob to his shoulders, black with blue tips, green eyes, goes without a top (shirt), the pants he wears are black with a blue tint, wears a boar mask, uses a breathing technique that he invented himself called the breath of animals.

A burgundy uniform, red short hair and ragged eyes, a red green haori with a black checkered pattern, always encouraging and trying very hard, has a sister, Nezuko, who became a demon but was not killed and he carries her in a box on his back, also his sister does not eat people, but only looks very cute and helps when possible, Tanjiro also has two breaths: the breath of day (fire, as they called it in his family) and the breath of water

He's a pillar/hashira, his hair is quite long. Anyone who's watched the anime KRD knows what he looks like. His hair is yellow with red tips. His uniform is brown. His eyes are yellow with red. He always smiles, speaks loudly, and is always encouraging. He uses fire breathing.