Tanjiro's

Tanjiro is the main protagonist of the anime: Kimetsu no Yaiba (also known as Demon Slayer). He has a scar on his head, and he's also part of the Demon Slayer Corps, and his job is to slay demons. His journey starts off with a demon killing and eating his family, and only his sister Nezuko surviving. Nezuko turns into a demon, however, and attacks Tanjiro. After a bit, however, she stops attacking and decides not to eat him, for whatever reason. Tanjiro is a very kind person and takes care of his sister well.