I want to display a user's character and I need to know how to collect that data.
Your question is not very easy to understand, do you want to get the image of a players character? if so, Use this, inside a local script.
script.Parent.Image = "http://www.roblox.com/Thumbs/Avatar.ashx? x=100&y=100&Format=Png&username="..game.Players.LocalPlayer.Name--PLAYERS if game.Players.LocalPlayer.Name:sub(1,6) == "Guest " then --GUESTS (so it doesnt turn out in an X) script.Parent.Image = "http://www.roblox.com/Thumbs/Avatar.ashx?x=100&y=100&Format=Png&username=ROBLOX" end