Yoriichi Tsukiguni was born in the 1400s in the early Sengoku Period. He has a brother named Michikatsu Tsukiguni who became a demon under the name Kokushibo. Yoriichi is typically very calm and reserved, never showing any emotions, only his deceased wife Uta knowing how to understand his emotions without him saying or doing anything. Yoriichi is the first ever user of Breathing Styles and creator of Sun Breathing and its immediate derivatives. Yoriichi is very powerful, but hates fighting.