Well, one way you could do any character in any position is to do a concept drawing of it. Front, side, quarter views. Then maybe some kind of action pose. Once you have the concept is a matter of translating the visual information from the drawn medium to the pixel.
What about other living beings or non-humans? How am I supposed to know their side views?
Did you seriously just ask that question?
If you don't know what something looks like, GOOGLE IT. The only reason you know what Patrick looked like is because you saw an IMAGE of him. Go to Google and get IMAGES of everything else.