I have disected Warios moves and mannerisms in Smash, to find a possible origin for each of them.
I won't mention the Shoulder Charge, Bike or Wario Man, because those are as obvious as you can get.
The chomp was likely inspired by "Hot Dog Hog" a microgame from the first Wario Ware:
One of it's customs is almost identical to the hyper suction from Wario World:
His down throw is the ground pound:
His up tilt may be inspired by his winning animation in the Twisted microgame "Catch of the day" :
His up smash in Smash 4 is very similar to the headbutt in World:
His up B seems to be a variation of the Corkscrew Conk from World.
His down tilt might be based of the courser from Smooth Moves:
His jumping animation in Smash 4 is similar to the classic Mario jump, Wario has taken over his games in several microgames, mimicing all of Marios mannerisms: