The URL is:
http://i39.photobucket.com/albums/e180/AnimalXingFreak/ssbg_____.png
Replace the ____ with the name of the character you want.
Wario is .../ssbgwario, Link is .../ssbglink, etc. Due to space constraints, I had to shorten some names. Here are the shortened ones:
Donkey Kong: .../ssbgdk
Pokemon Trainer: .../ssbgtrainer
Diddy Kong: .../ssbgdiddy
Also, these all can fit in the banner in the upper-right corner. *pokes banner* Change it if you want, Shiroi. It's up to you.