Her name is Yoriichi Tsugikuni she is the strongest demon slayer and she uses Sun breathing. She is 24 years old. She is extremely stoic woman of peace and reverence but she is kind ,humble and very Intelligent. Yoriichi is a very skilled demonslayer. She was born with her demon slayer mark. She also has an older twin sister name Michikatsu Tsugikuni. She has mastered forms of sun breathing. She uses a bright red Nichiren sword to kill demons. She loves to travel and see the world.