As the Ultimate Soldier, Mukuro is a cold-blooded assassin that carries out acts of murder without hesitation and shows no signs of remorse for doing so. Part of this may be because of the abuse she was subjected to by Junko herself. As a result, Mukuro follows every order given from her sister, rarely ever expressing her own thoughts and opinion on the matter. She can often be masochistic and cold, but if someone shows her a genuine smile, it can make her protective over them.