Sweet, gentle, determinated, strong and innocent boy that love making friends everywhere, is too rare to see him making enemies, his dream is turn his demon sister into a human again and go back to his home with her, he hates violence but he has to do a work that's includes violence, he is such a beautiful boy but a little bit feminine, he has 15 years old, his father died when he was a kid, that meant that he had to work selling coal from a very young age to support his family (his mom and his 4 brothers), but a demon obsessed with him came to his house and when he saw that Tanjiro wasn't there, he slaughtered his family but left his sister alive but converted into a demon, but the sister became a friendly demon who dont ate humans and only follow Tanjiro and sleep
