Halliday, the creator of the Oasis, in real life, as seen in the movie "Ready Player One", was a rather medium height man with a pale skin color and dark-ish brown hair that is untidy and all poofing out.
In his opinion, spending time in real life with friends and families is what really matters.

As Parzival, his appearance is similar to Danté with the exception of a gold ThunderCats belt buckle. He made his avatar more muscular and thinner than his real self.

"In the OASIS, you can become whoever and whatever you want to be, without ever revealing your true identity, because your anonymity is guaranteed."
----Wade Watts