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. Despite this, she appears to portray her sister's very different personality rather well. She herself admits that she lacks skill in negotiating with others and planning tactics in advance, despite her renown as an excellent soldier. While she is completely fearless as a soldier, she is afraid of certain emotional situations.

Mukuro has been verbally and physically abused by her sister for years. She only knows how to take orders from Junko and obeys her even if she doesn't agree with her. Mukuro craves her sister's praise and acceptance and will do nearly anything to get it. Because of this, Mukuro allows herself to be constantly abused by Junko and takes her insults to heart. Mukuro believes she is the only one who truly understands her sister and she wants to make her happy, so she stays by Junko's side even when she insults her. She also finds pleasure in Junko's attempts to harm or even kill her, knowing that her sister will experience tremendous despair if she succeeds. She is sometimes portrayed even disturbingly obsessed with her sister, with her blushing and in a state of ecstasy.

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