Cup Knight (カップナイト?) is a demon in the series.
Knight of Cups is a tarot card from the minor arcana Suit of Cups. It represents change and new excitements, especially those of a romantic nature. It can also mean invitations, opportunities, and offers. They are a person who brings ideas, opportunities and offers. Constantly bored and in constant need of stimulation, but also artistic and refined. Knight of Cups represents a person who is amiable, intelligent, and full of high principles, but a dreamer who can be easily persuaded or discouraged.
Kyūyaku Megami Tensei
Megami Tensei II