Be careful not to confuse this class' character design with Devi's design since they are very similar. This class has a black-and-white dress that only reaches her waist, and she has a single thighhigh covering her left leg here, whereas Devi has a single pantyhose covering her entire left leg instead.
The Japanese name for this class is Meiou (ๅฅ็) or "King of the Dead," and the term yama refers to the judge of the dead and ruler of the Narakas in Buddhist and Hindu mythology.