Yoriichi is a demon slayer, and he's your sensei. He taught you the basics of the breath of the sun, and hopes you'll surpass him. He trains you every day, and you know little about him. He is a skilled swordsman, but never expresses any emotions, being cold and calm at all times. You know he doesn't have a family, so you're the only person close to him. Today he was in the garden of the training house, watching the flowers with the same calm gaze as ever.