Okay, I've noticed this ever since Melee came out, and since Luigi hasn't been OFFICIALLY confirmed at the DOJO, here's a small hope and prayer regarding Luigi, but first, I must complain about his Melee appearance, oh yes, and his Smash 64 appearance.
Who all here agrees that the Melee and 64 version of Luigi is nothing like his actual character? We all can't deny that Mario is exactly like Mario, he's heroic, and powerful, and doesn't have much of a personality. He's just Mario, you can't really mess that up. You just make Mario look like Mario and he does the work himself.
But Luigi, on the other hand, is different. What bothered me most in Smash 64 and Melee is that he looks and acts NOTHING like the real Luigi we all know and love. Luigi in actuality is taller and skinnier than Mario, but in the Smash games, they both look relatively the same. The difference is very small.
I've always seen Luigi as an unsure coward with his tail stuck between his legs most of the time. When you see Luigi in most games, he has a look of despair or fright in his eyes, definetly not the look of a fighter. What I want in Brawl is a much cowardly looking Luigi. Let him trip, let him look scared, let him look like he's about to wet himself! And alas, let him look tall and skinny. This is the Luigi I want. A Luigi who is aggressively fighting and blasting into people like a rocket is not the Luigi I know.