(covers information that was retroactively changed)
Diane Overdiek was a notable comedian.
In 2365, Data attempted to located a comedian to help him better understand the concept of "what is funny?". Overdiek was among the holodeck program files that were contained aboard the USS Enterprise-D. The program code list for this comedian was EN-54395. (TNG: "The Outrageous Okona", okudagram)
This character was only mentioned in writing.
Diane Overdiek was mentioned in the biofilter analysis in "Shades of Gray". The analysis was a copy of a list of comedians first seen in "The Outrageous Okona".
For the remastered version of the episode, Diane Overdiek was replaced by Steve Wiener.