I think a faster version of their Assist Trophy attack would work fine for their Final Smash. As long as it gets a little more killing power, though. The AT version did a lot of damage, but it couldn't really kill.
EDIT: Also, I just had a thought about how a reveal trailer might go for them. It could be in the artstyle of WarioWare Gold, and Wario could be looking up info about the Smash Ultimate tournament. Then he sees the reward for winning, and goes mad with greed. But then he considers that he might not win, so to get the best shot at winning, he considers calling his friends, because two fighters in the tournament have twice the chance of winning. He starts to consider each of his friends in turn (with his thoughts visible), with a red X appearing over the ones who can't fight. He briefly considers Ashley, but then imagines her giving him a cold refusal. He then considers Cricket and Mantis, but then realises that Mantis would probably rather be off doing his own idea of "training", and Cricket would follow him. The only candidate left is Kat & Ana, so he calls them up immediately. Cue their entrance animation on the battlefield (maybe not actually Battlefield, though. Assuming there will be no new stages, perhaps Suzaku Castle? It's kinda ninja-ish in design) and then there's the usual montage where they show off their moves.
Just a dumb idea I had, anyway.
EDIT: Also, I just had a thought about how a reveal trailer might go for them. It could be in the artstyle of WarioWare Gold, and Wario could be looking up info about the Smash Ultimate tournament. Then he sees the reward for winning, and goes mad with greed. But then he considers that he might not win, so to get the best shot at winning, he considers calling his friends, because two fighters in the tournament have twice the chance of winning. He starts to consider each of his friends in turn (with his thoughts visible), with a red X appearing over the ones who can't fight. He briefly considers Ashley, but then imagines her giving him a cold refusal. He then considers Cricket and Mantis, but then realises that Mantis would probably rather be off doing his own idea of "training", and Cricket would follow him. The only candidate left is Kat & Ana, so he calls them up immediately. Cue their entrance animation on the battlefield (maybe not actually Battlefield, though. Assuming there will be no new stages, perhaps Suzaku Castle? It's kinda ninja-ish in design) and then there's the usual montage where they show off their moves.
Just a dumb idea I had, anyway.
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