Card Trivia:Dark Blade
- This monster appears in the artworks of "Centrifugal Field", "Dark Contract with the Yamimakai", "Formation Union", "Frontline Base", and "Fusion Deployment".
- This monster is wearing "Metalsilver Armor".
- This card has a retrained version: "Dark Blade the Captain of the Evil World".
- This card has a "Memento" counterpart: "Mementotlan Dark Blade".
- This is one of only two monsters that has two different Union monsters designed for its use, the other being "X-Head Cannon", which shares this card's Level, ATK/DEF, and Normal Monster card type.
- The two monsters that are designed to be equipped to this monster are "Pitch-Dark Dragon" and "Kiryu".
- Outside of the "A-to-Z" monsters, this is the only monster that is a Fusion Material Monster for a Fusion Monster ("Dark Blade the Dragon Knight") along with one of its Union monsters ("Pitch-Dark Dragon").
- This card's English flavor text mentions "Dark World". This is a translation error, as its Japanese text instead references "Makai" (闇魔界), which implies that this monster serves "King of Yamimakai".
- This monster bears a strong resemblance to "Underworld Fighter Balmung". Both have the same Type, Level, Attribute, and they wear similar armor.
- They both have "Makai" in their OCG names.
- In the D.D. Castle: Assault event of Yu-Gi-Oh! Duel Links, Axel Brodie disguises himself as this monster while infiltrating the Supreme King's castle and acts as the castle guide accompanying Tour Guide From the Underworld. He sheds the disguise later on as he gets closer to the top.
