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A character from Super Mario Sunshine. He was originally known as "Boss Teresa" (Boss Boo) in Japan, but a sloppy localization resulted in him having the same name as the real King Boo in the English version.
Despite the uncanny resemblance, Boss Boo isn't really a Boo at all, but rather a product of Bowser Jr.'s doing, and is made out of goop [1]. Defining characteristics that set him apart from the real King Boo are his lazy aqua eyes and ridiculously oversized tongue (which is big even by Boo standards).
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