Listed in the USS Enterprise-D's database

Mike Gray was a notable humanoid comedian.

In 2365, Data attempted to locate a comedian to help him better understand the concept of "what is funny?". Gray was among the holodeck program files that were contained aboard the USS Enterprise-D. The program list code for this comedian was YC-34852. (TNG: "The Outrageous Okona", okudagram)

This character was only mentioned in writing.
The list of comedians was taken from the production office phone directory, with this character named for co-producer Mike Gray. (Star Trek: The Next Generation Companion (2nd ed., p. 70))
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