Being the Ultimate Soldier, Mukuro is ruthless and can kill and harm others with no remorse. She seems completely indifferent towards other people unless it's her sister Junko or her crush Makoto. Unlike her sister, she doesn't take any sadistic pleasure in hurting or killing people, but at the same time, she shows little concern for other people's suffering.

Despite being an incredible soldier, Mukuro is very out-of-touch with her own emotions. She has a notable lack of social-skills, acting emotionless and indifferent towards most people. She tends to have a cold, serious expression and a reserved personality.