Yorichi Tsugikuni

Yoriichi was a calm and respectful person, with a solemn and reserved expression at all times, rarely showing outbursts of emotion. Overall, Yoriichi had a low and composed disposition to match, evident when he killed demons without changing his expression or when Muzan was caught off guard by his immense skill because he seemed modest. He was also extremely humble, seeing himself as just any other man and no one special despite his godly attributes; an example was the time he performed the Breath of the Sun postures for Suyako at her request and almost seemed embarrassed after her.

Despite being mostly indifferent, he experiences strong emotions; He mourned the loss of Uta and her unborn child for ten days straight and began to cry when he saw the joy Sumire showed at the simple fact of being lifted up. He also smiled warmly and expressed his gratitude to Sumiyoshi after his friend told him that his life was not useless and promised to preserve his Sun Breathing techniques through his descendants. Yoriichi is also very kind, shown when he was on his way to find a midwife in preparation for the birth of his son, he accompanied an old man he met on the way to see his deceased son.

Physically he is similar to his brother in his human form, except for slight differences such as the fact that he has had his Demon Slayer Mark since birth, which is located exactly in the same position as Kokushibo's. As a young man, Yoriichi was thinner, wearing a red Haori with a white interior along with a khaki-colored male Kimono, with two black and white underwear and a Hakama of the same color. He wears the same Hanafuda earrings which would be inherited by her and carries a Katana attached to him as is the custom of most Demon Slayers.