He is Japanese. While seeming at first like a stern, grouchy old man, this hides an extremely compassionate personality. He’s shown to be an extremely strict instructor, but he also cares for his pupils deeply, viewing them as family. Lives in a tiny house near Sagiri mountain. Sakonji is a very powerful swordsman, he can fight Oni easily. As Hashira, he was once one of the Demon Slayer Corps' most powerful fighters. Demon slayer corp is ruled by "Oyakata" - Kagaya Ubuyashiki.