A background pony with no official name that appears in the episodes "Suited for Success" and "A Canterlot Wedding" spinning music. The alternate name of "DJ PON-3" has been featured in an official ad (simply pronounced "Deejay Pony").
She is a white unicorn with blue and teal streaked hair, cerise (vivid pink) eyes underneath a set of purple goggles, and has a pair of eighth notes for her cutie mark.
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(A more clever ad from the Ponygoons Ad System would be here if you had AdBlock off)