Coin Knight is a demon in the series.
The Knight of Coins, or Coin Knight, is based on the tarot cards from the minor arcana, Suit of Coins (or Pentacles). A Knight is considered the appropriate card for a male teenager or young adult. Coins are considered the darkest of the suits in terms of choosing based on appearance and represents dark-skinned, dark-haired people. A Knight of Coins would be used to represent a young man who has a dark complexion and features. The card might represent someone who is stubborn or hard-working, serious, and set in their ways.
The Suit of Coins cover material aspects of life including work, business, trade, property, money and other material possessions. The positive aspects of the Suit of Coins include manifestation, realization, proof and prosperity. The negative aspects include being possessive, greedy and overly materialistic, over-indulging and not exercising, not effectively managing one's finances, and being overly focused on career to the detriment of other life priorities. Often what is required to counteract these negative aspects is a return to nature to ground oneself and rediscover what is truly important.
Kyūyaku Megami Tensei
Megami Tensei II