Card Trivia:Ryu Kokki
- This monster appears in the artwork of "Fuhma Wave".
- This card is based on Ryūkotsuki, the final boss of the Japan-exclusive Famicom game, Getsu Fūma Den. During the final boss battle, Ryūkotsuki transforms into its final form, which is a gigantic dragon-like demon, depicted in this card's artwork.
- This card's effect of destroying a Spellcaster or Warrior monster is a reference to Ryūkotsuki's rivalry with Getsu Fūma, the protagonist of Getsu Fūma Den who is a warrior with the ability to use magic. Furthermore, Getsu Fūma has a card form with a similar effect that destroys Fiend and Zombie monsters, further referencing the rivalry between both characters.
