Nice use of the Star Wars font
I find it interesting that you incorporated the Melee graphics over the Brawl renders. But, no Pichu? I applaud you on the sacrifice of the little rat for a Random spot.
When composing a roster though, you need to really consider the feng shui of it. What characters will make up the corners? What characters will make up the center border spots, creating a cross? What characters will surround the center spot? Also, the colors and form of each and every character contributes to the overall balance of the roster. I see your roster as one that starts out very colorful at the top, but upon descending, gradually decreases in saturation as you transcend from Mario, Luigi, Peach, and the like to Ganondorf, G&W, Marth, Ness and such.
Fox and Falco should definitely be together. If Marth and Roy (his clone) can be together, so can Fox and his clone. If I were designing this, I'd put the four Zelda characters in the center because they act as a nice fulcrum. Link and Ganondorf flanking the Random spot, with Young Link to Link's left, and Zelda to Ganon's right (as he always captures her in the games and her name, starting with Z, should place her at the end of the row). I know it may sound incredibly insignificant, but these small tidbits add up in the grand design scheme.