The day Wario will appear in a Mario & Luigi RPG game, it will be a blessing, but they probably won't use sprites anymore.
I immitated M&L style for old time's sake <3
One can almost here what he says (/grumbles) !
I don't know about the style emulation, but the animation itself is very well done
He was actually supposed to be a guest at Starbeans Café in Superstar Saga, along with (I think) Samus and Link, but he was eventually taken out.