Can anyone tell me if it is legal in MK CONQUEST to use more than one of the same unique figure like three amazon draconum for example? can they make up a formation?

no its not legal. but imagine the power if it was,OMG!:D

1) Nope. 1 Unique per player.
2) You cant make an amazon Drac group. A Dracs have bound.
Sorry :p

In conquest, figs with bound and of the same faction can move together for double their movement, just as if they used "double you move speed" half of the bound ability. Even though 3 A. Dracs would be illegal, an A. Drac and perhaps a few Galeshi Calvarymen could move in for mation for 12 inches.

nope, only one unique of each kind per army ... you can however field 10 or so DIFFERENT uniques ...