So I came with the idea of biker Wario in SSBC, I don't have many ideas but you can post your ideas here!
Regular attacks
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Considering that Wario is a bad Mario, the only thing we could change here is his down aerial to the one in the current SSB4, so it doesn't change too much.
Special Attacks
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Neutral B:Throws the WarioWare bombs from late WarioWare games.
Side B:The bike(Same)
Up B:Takes the jetpack from the final minigame of Wario games(Wario Ware Inc.: Minigame Mania).
Down B:(Mind helping with this one? The fart doesn't even appear in the WarioWare games...)(W.I.P.)
Smash Attacks
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Side Smash:Throws a vase to the ground.
Up Smash:Does a lil' Mario Bros. based jump from a WarioWare Inc. minigame.
Down Smash:(Mind helping with this one?)(W.I.P.)
Taunt
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Taunt:(Based from WarioWare Inc.:Minigame mania)Put his hands up making two fingers from each hand(Also maybe similar when Wario wins a boss battle in WL4).
For clarify more this, is the scene when Wario flies out of his house and come back, the pose he makes in the air...
Grabs
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Up grab:He throws the opponent to the air and a balloon appears and explodes.
Down grab:Takes a skate and starts to skate and jumping with the skate over him.
Side grab:Use a wiimote as a bat and kicks him with the wiimote.
Victory Pose
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Like in SSB4 he pull out his bike and start doing his moustache and hand things only one time.
Some information
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Maybe I taked a bit of ideas from the Wario Man SSF2 moveset.