Sadie, known as Seiko in the Japanese version, is a character in the Tag Force games. This is a video game version of Sadie, a character from the Yu-Gi-Oh! GX anime.
Sadie can be found in the Shop, but she cannot be dueled until the player beats the game with at least 5 different Tier 1 characters. Once unlocked as an opponent, if the player can defeat Sadie, she will agree to being their partner.
In the first three games, Sadie uses Burn Decks that lock down the field and destroy her opponent's cards.
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