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|Occupation||Card shop clerk|
|Anime debut||Yu-Gi-Oh! GX episode 4: "Raring To Go"|
|Video game debut||Yu-Gi-Oh! GX Duel Academy|
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 episode 4 do name her.
Sadie is pulled into the alternate dimension with the rest of Duel Academy. She and Dorothy take responsibility for rationing the food during the ordeal.
Tag Force series
Sadie appears as a special unlockable opponent in the first three Tag Force games. She is also featured in Tag Force Special.
Sadie works at the card shop. During weekdays she can be found in the Forest, thanking the player for being a regular customer and apologizing to them for running out of packs. She is the shop's cashier during weekends and during special events.