The fact that he’s an Assist Trophy means he won’t be appearing as a playable character, but...
...Waluigi appears nonetheless!
He dashes at foes...
He stomps on whoever he currently despises!
Characters that suffer his stomping get embedded in the dirt.
Waluigi keeps on stomping, punishing his foe persistently with successive blows. As should be expected from Waluigi.
He finishes with a mighty kick...
...or his tennis racket!
Never forget to finish off those who are helpless to resist. Such a philosophy should really be expected from Waluigi.