When Mizuki first used this technique some of her clones attacked her do to the more negative aspects of her personality, while other clone refused to, or were afraid to fight. This was obviously a problem, this drawback can be over turn through training the different personality clones to fight and work together as a team. Another drawback is the amount of clones Mizuki can create that possess an personality aspect if she were to create to many she would not only possibly forget who she is completely, but would go in to a coma due to a rapid division of herself. So her limit is 7 clones. If the target has a strong will then they can override the clone's control and the personality aspect will return to Mizuki.