Excluding both legion pairs, all members of the Duo archetype have two different artworks, a black version and a white version, hence the naming.
The Duo playstyle revolves around utilizing cards with the same name for various purposes. They might power up cards with the same name (Duo Beast Ear, Lu Lu), reveal cards with the same name from hand to unflip a card used to pay a Counterblast cost (Duo Night Wing, Tangariro), search the Deck for copies of cards (Duo Mini Heart, Rhone), or use cards with the same name to pay a skill's cost (Duo Temptation, Reit).
Who are the Duos?
It is a special project that promote idols with "black" and "white" costumes and characters. The promotion method is also complicated, ranging from the common setting of "outer self and inner self" to "treating white and black as different individuals", and it is different for every member. The project includes not only rookies but also famous idols of other groups, making it a huge project of the entertainment industry.
List of "Duo" Cards
|Duo Cotton Sleeper, Ichika||Mermaid|
|Duo Grampus Turn, Shannon||Mermaid||Trigger (Critical)|
|Duo Lamplight Melody, Tigris||Mermaid||Trigger (Draw)|
|Duo Love Joker, Chulym||Mermaid||Trigger (Critical)|
|Duo Lovers Singer, Darling||Mermaid|
|Duo Minimum Truth, Rhone||Mermaid|
|Duo Morning Charm, Liffey||Mermaid||Trigger (Draw)|
|Duo Night Wing, Tangariro||Mermaid||Trigger (Stand)|
|Duo Pride Crown, Madeira||Mermaid||Trigger (Critical)|
|Duo Soulful Melody, Selenga||Mermaid||Trigger (Stand)|
|Duo Treasure Hunter, Suwannee||Mermaid|
|Duo Tropical Healer, Medjerda||Mermaid||Trigger (Heal)|
|Duo Absolute Sister, Meer||Mermaid||G unit (Stride)|
|Duo Amazing Sister, Meer||Mermaid||G unit (Stride)|
|Duo Everlasting, Reit||Mermaid||G unit (Stride)|
|Duo Idol Emperal, Kuna||Mermaid||G unit (Stride)|
|Legendary PR♥ISM-Duo, Nectaria||Mermaid||G unit (Stride)|