From the Super Mario Wiki
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Microbuffer is a microphone with blue eyes, a mustache, and a tuxedo in Donkey Kong 64. It is a spoof of the real-world boxing announcer Michael Buffer. It introduces K. Rool and the Kongs in the final boss fight, gives very dramatic descriptions for each Kong and moves around by hopping. The Microbuffer seems to be a functioning microphone all on its own.