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'''Sadie''', known in Japan as '''Seiko''', is a young lady who works in [[Ms. Dorothy]]'s card shop. Her personality is generally cheerful and unassuming. Her name is never given in the English version of the anime, but she is named in the video games. The Japanese credits of [[Yu-Gi-Oh! GX - Episode 004|episode 4]] do name her. She claims to have little knowledge of how to [[Duel]], but can can be faced as a opponent in the ''[[Yu-Gi-Oh! Tag Force|''GX Tag Force'']] series, in which she is usually a tough opponent.