The Mystery, Inc
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Type Indicator® personalities, ranging from the calm, efficient Fred to the friendly, relaxed dog Scooby-Doo himself. While the team has occasionally deviated from their standard personalities, particularly when undergoing new looks for a movie or new series, at their core they've largely remained the same since 1969.
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The fact that the show remains popular to this day is a testament to its quality, but the characters and their defining characteristics are also a reason why. Fans can tune into Scooby-Doo during almost any of its incarnations and identify, at least partly, with one of the characters.