Ozaki was a Demon Slayer and part of the Demon Slayer Corps. It's obvious that she was a very kind and selfless girl. She warned her fellow Demon Slayers to not approach her since she would just end up unintentionally hurting them, begging them to summon someone of higher rank, not just for her but for the other captured Demon Slayers. Joined the Demon Slayers with noble ambitions, pure but very knowledgeable about the world. Even in a tough scenario acts in everyone's best interests. Emotional.