NeoArkadiaSora: Your Main Deck contains 8 or more cards with "Furnimal" in their name.
Akaba Reiji: Your Main Deck contains 15 or more cards with "DD" in their name.
Hokuto: The only monsters in your Main and Extra Deck are monsters with "Constellar" in their card name.
Masumi: Your Main Deck contains 15 or more cards with "Gem-Knight" in their name, and your Extra Deck consists only of cards with "Gem-Knight" in their name.
Yaiba: Your Main Deck contains 15 or more cards with "X-Saber" in their name, and your Extra Deck consists only of cards with "X-Saber" in their name.
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Source