Wolf's in. Don't shatter my dreams.
In all seriousness, his playstyle is much, much different from any other fighter. His fair is like the only one in Brawl that knocks up. His nair has unique sex kick properties, his uair is a unique juggling move, he has an awesome spike, Wolf Flash is among the most intriquing moves in the game in its design, his melee-range blaster is awesome, his Usmash looks and sounds hella cool, and yes, dat Side Smash. And unique throws, especially the properties of down throw. He offers more than just Side Smash.
His weight, fighting stance, air speed and other attributes (such as fast walk, slow run, opposite of Fox) are all unique from Fox, minus his fast falling.
Wolf is (albeit partially thanks to my bias) a more distinctive member of the roster than Lucas.