Ryukotsuki appears as the main boss in Harmony of Despair's DLC chapter, The Legend of Fuma. He transforms into three different forms:
- In his first form, he's just a regular-sized cloaked enemy wearing a horned skull mask. He attacks by shooting fireballs and jumping at the heroes from time to time.
- His second form is a tall warrior with long red hair and heavy armor. He wields a shield and attacks by throwing knives at the heroes.
- In his third and final form, he'll transform into a gigantic dragon-like demon conformed by different kinds of bones, with his arms and legs being made by several skulls. A red orb is encased inside his thoracic cage and serves as the monster's weak spot, although it's impervious to most forms of attack. He attacks by summoning a series of swords to rain on the heroes, by swiping with his claws, by shooting three bouncing fireballs from his mouth, and by summoning an alien-like creature with two heads. His humongous size can also be considered as a form of attack, as he'll advance toward the heroes, reducing their area to maneuver.
Her loyalty is maintained through her personal honor... as well as an invoiced bill for the price of resurrecting her. The amount is ludicrous, and intentionally designed to take a long time to pay off. Ryukotsuki occasionally attempts to gamble in order to lower her debt, although this usually goes badly. She pilots the Serpent Core, a radical Core battleship based on Gillador and the snake enemies from Neo Contra.
- Ryukotsuki makes a cameo in Chapter 20 of Warera Hobby's Famicom Seminar.
|Enemy Data: Ryukotsuki|
|Image||Name - Game|
|A fiend who hails from the deepest pits of hell.|| Drop: Yasutsuna +1 (Hard), Muramasa (Normal), Muramasa +1 (Hard), Nebula (Hard), Luminatio (Both difficulties), Healing Mail (Normal), Fuma's Greaves (Hard), Ebisu Raiment (Normal), Thief Ring (Normal)|
Soul: Ryukotsuki (0.5%)
| Chapter 11|
- Ryukotsuki also appeared as a card, called Ryu Kokki, in Yu-Gi-Oh!, along with Getsu Fuma, the protagonist of the game Getsu Fūma Den.
- A female parody of Ryukotsuki appeared in the 2011 Xbox 360 horizontal scrolling shooter game Otomedius Excellent, along with Gesshi Hanafuuma, a female parody of Getsu Fuma.
- Ryu Kokki at the Yu-Gi-Oh! Wiki
- Ryukotsuki at the Gradius Wiki
- Ryukotsuki information from Getsu Fūma Den at StrategyWiki