Would be helpful to know what program you're using. If you're using Photoshop, use the pen tool to out line your render. Then, right click and select "Select" or something similar to that. That Ctrl+x to cut it, and paste on a new transparent background.
[IMG]http://i398.photobucke*****m/albums/pp69/Sirnewell/Naruto_render.png[/IMG] Here it is. It isn't too bad , is it?
bobobo