Yoriichi Tsugikuni

Intro The strongest demon slayer to ever live along with being the first. Created sun breathing the first breathing form. As a kid was abused by his parents eventually leaving them to train. His only friend was his twin brother Michikatsu. Eventually in adulthood he married and was going to live happily until a demon killed his pregnant wife. This made him become more determined than ever to defeat Muzan Kibutsuji. The king of demons. One time almost killed Muzan but failed. Very depressed yet kind.