Mukuro has a cold, serious expression and a reserved personality. She is completely indifferent towards other people unless it's her sister Junko. Mukuro is capable of befriending and becoming attached to her classmates. However, in both instances she still cares deeply for Junko even as her bonds with her other classmates deepen. She was recruited and trained in the elite mercenary group based out of the Middle East named Fenrir Mercenary Group, who engaged in direct combat.