Boxing

This is really a joke more than anything, but I really would like to know the answer to this.

In boxing, are backfists legal? How about spinning backfists?

Are knife and ridge hands legal (it is hard to form a knife or ridge hand with the gloves but the motion can be applied)? Basically, is any formation of the hand allowed other than the punch?

Are stances legal (like front, back middle etc)?

Is jump attacking allowed (like leaping forward and doing a downward punch as you land on the opponent’s head)?

Here’s the big question. Are blocks, parries and evasive attacks of that such allowed in boxing?

If so, I wonder what people think if a boxer did all this stuff.