Which gaming mascot was originally created as a placeholder graphic during development but was so well-received that the company adopted it as their official brand ambassador?

Brand mascots have become iconic elements in the gaming industry, representing companies and franchises across virtual worlds. These digital ambassadors often transcend their games to become cultural phenomena. From console mascots that defined generations to characters that revolutionized gaming marketing, how well do you know the history and impact of gaming's most famous brand representatives? Test your knowledge of gaming mascot history with this challenging question!

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Sonic the Hedgehog (Sega)
Kirby (Nintendo)
Crash Bandicoot (Naughty Dog/Sony)
Master Chief (Microsoft/Xbox)