- This Monster appears in the artwork of "Formation Union".
- This card has the highest combined ATK and DEF of any Union monster.
- This is one of the very few cards that can be Tributed while it is an Equip Card.
- This card's name is a combination of the the Japanese terms "き" - ki (spirit), and "りゅう" - ryu (dragon) -- literally, 'spirit dragon'.
- This may be misunderstood because the Japanese word of this card name is "騎竜" which "騎" pronounce "き" - "ki" means 'to ride(an animal or bike)' not "気" that also pronounce "き" - "ki" that means 'spirit' or 'mind'. "竜" pronounce "りゅう"-"ryu" means 'dragon' so that "騎竜" means 'riding dragon' but the correct meaning should be 'knight dragon' when these two words come together.
- Interestingly, there is already a card named "Spirit Ryu", a Fusion Material Monster with "Warrior Dai Grepher" - the monster who may eventually have become "Dark Blade".
- This may be misunderstood because the Japanese word of this card name is "騎竜" which "騎" pronounce "き" - "ki" means 'to ride(an animal or bike)' not "気" that also pronounce "き" - "ki" that means 'spirit' or 'mind'. "竜" pronounce "りゅう"-"ryu" means 'dragon' so that "騎竜" means 'riding dragon' but the correct meaning should be 'knight dragon' when these two words come together.
- This Monster has the same level, Type, Attribute, ATK, and DEF as "Curse of Dragon".
- This Monster shares its name with the Japanese name for Kalin Kessler, which is Kiryu.