How many characters that appeared on Batman: The Animated Series made appearances on Batman Beyond...(You can include Batman Beyond: Return of the Joker in your answer.)?
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You are SO close. There's only one name you're missing...Kairi Tanaga. She was the girl that trained with Bruce in Japan during the Batman episode "Day of the Samurai". She returns in the Batman Beyond episode "The Curse of the Cobra".
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