Ok...I think that maybe I can describe...
As far as looks go, the video above says that much: dirty blonde hair and defined features
His voice...like a slightly higher version of kyle's, though not annoyingly so
Maybe that works, but idk *shrug*
Interesting facts: Matt Stone usually does his voice when he has the hood on, but Mike Judge did his voice in the movie when he took his hood off. Eric Stough does his voice on the show when he doesn't have his hood on.
The only episode where he talks with his real voice is "The Jeffersons", I think. There was also a small part in "Lice Capades".