Yes, if by example you kill a creeper, you will be a creeper, if you kill a
enderman, you will be a enderman, some monsters as the ghast has powers when transforming, so if you kill a ghast you can throw fireballs
have fun... it was so hard to make
PS: SADDLY FOR SOME REASON IT DOESN'T WORKS WITH WITCH, MAYBE BECAUSE THROWING POTIONS CAN
CAUSE EXTREME LAG... I DON'T KNOW WHY.