Not shape, per se, they're the same shape for competitions (+/-).
It's the weight, weight distribution and rigidity.
A very heavy, stiff and top heavy blade would be very offensive, since it would generate a lot of speed but you'd be lacking in control.
>Very offensive 5+2-ply blade.
It took me a moment to get this, the racket looked pretty pleasant to me. I wonder what makes a racket more offensive or defensive, would it be the shape? Or maybe the weight distribution.