Maybe drawing inspiration from the Road Runner might not be the best idea, but truth be told... I find the smoke cloud in Megaman X to be rather ugly. I also believe that dust does in fact form puffy clouds (refer to exhibit C). I could do with the happy cloud idea, the little blue guy is supposed to be fairy-esque after all. Gallery: A, B, C
The dust doesn't look like dust. Dust doesn't form puffly clouds. Look for Mega Man X games where he dashes and forms a smoke cloud. That should help you.
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