This has me feeling surprisingly nostalgic. I love Brawl, but it would have been amazing to see everyone come back. ...except for Pichu and Dr. Mario, Pichu basically evolved into the Pikachu of Brawl and Doc? Well...it's Mario.
... Ah heck. I'm just gonna go play some Majora's Mask.
I hope Super Smash Bros. 4 brings back Mewtwo. I didn't even really like Mewtwo before Brawl came out, but I guess you don't know what you have until it's gone.