>>103580603Generally Sigma usually has 2-3 forms
Form 1: He fights with a weapon (Lightsaber in X1, Wolverine Claws in X2, Captain America Shield in X3, Reaper Scythe in X4, etc).
Form 2: He turns into a giant robot with hands and beams and shit
The only exception is X8 where he only has one form
because he's not the final boss 
