Honey Kisaragi, AKA "Cutie Honey". Honey Kisaragi is a normal catholic high school student who receives a rude life awakening when her father is murdered by an evil organization known as the Panther Claws, she then finds out that she isn't even human but rather an android created by her father to fight them. Using the Airborne Elemental Fixation device she can transform herself into 6 different personalities including the battle form Cutie Honey.
Gainax!Cutey Honey. Be careful, Gainax's version has some scenes with nudity and breast-physics ("boob-jiggling") in them. But, fan-services aside, is a good anime to watch (specially if you are a vintage mahou shoujo lover!).