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THe A5M was a pretty plane with the elliptical wings and the interesting upper fusa;age and tail.
And the A5M3 prototype (with Hispano-Suiza 12x V-12) looks very sleek too, the inline engine blending very well with the design.
The Oscar always looked a bit frail and malnourished for my liking.
I think the N1K-J (probably the N1K2 moreso) was the most substantial, purposeful, and rugged looking of the Japanese fighters. (and the look fits pretty well with the actual characteristics of the plane)