A club dancer and freelance assassin from the Niwa Clan, Karen is a mysterious and beautiful assassin who gets her jobs done with ease thanks to her reinforced nails that can rip through skin like butter, though she rather does better with weapons but she can also punch if necessary. Karen is an efficient person who gets her contracts done in fast and effective ways, she might be cunning, and with her beauty, she also might be manipulative and charismatic.