That's really a matter of opinion that would only cause a fight between 50 Cent and Akon fans. And since they aren't even in the same genre, it wouldn't be a real battle.
R2D2 has already proven he is one tough little bot. Akon would probably get in a few good hits, but R2 just keeps on coming, and would wear Akon down in the end. It would give Akon a good story though. It isn't everyday that you can say you got your butt whipped by a Jedi's robot.
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herrerasaurs would win
An AT-AT would definitely win.
carcharodontosaurus would win
Of course Pikachu would win!
Contributor Opinions:Frieza would win.
...ta.rzan would win
The Fallen would win. He is a prime and Megatron is not.
Chuck Norris would win.
Godzilla would win. He is bigger and stronger.
Most likely the dog would win.