Dragon Ball: Launch

Launch is a woman with a strange disorder which causes her to switch between two different personalities each time she sneezes. Her first personality is a blue haired woman, who is sweet, pure-hearted and cheerful and always ready to help. Her other personality is a blonde haired woman, who is angry and trigger-happy and commits crimes for money and is quick to respond with gunfire when angered. Neither of Launch's personalities remembers the other's actions, or anything they said, that is until the King Piccolo arc, which is evident when she remembers who Krillin was when he died.